MMA fighters are not thugs. Many well-known fighters, such as Randy Couture and Dan Henderson, have college degrees. Carlos Newton is a doctor in geriatric medicine and actually owns a geriatric care facility. Hidehiko Yoshida represented his country in the Olympics. Mirko Filipovic served as a member of his country's anti-terrorist police, and served as a representitive in parlament. Matt Lindland ren for public office as well during this latest election. Pat Miletich, Matt Hughes, Ken Shamrock and others have worked with or donated to the military. Terry Martin is going for his doctorate degree in Law and tries to keep the local kids off the streets. Genki Sudo is famous for coming into the ring with a banner that says, "We are all one", with all the world's flags on it. Chris Lytle's day job is as a fireman.
Bottom line: MMA fighters are people. You're going to get some guys with a bad attitude, just like all walks in life, but there are more than a few who are excellent role-models, men and women who have families, people who give back to their community.
MMA is actually less dangerous than boxing. If you ever get the chance to check out Compustrike scores, you'll see that MMA fighters take fewer shots to the head, meaning less brain-damage is suffered over the long run. Even boxing's standing eight-count rule basically allows a guy who almost got knocked out to continue fighting. In MMA, if a fighter is knocked down, the referee won't wait too long before stopping the fight. Another factor to consider is that boxing is only strikes, while MMA includes grappling. I've seen matches ended without a single punch or kick being landed.
In MMA, you don't "eat,sleeps and drinks fighting". I know plenty of people who train in MMA and its related systems as a hobby, something to do for fun. They have no ambitions to become MMA champions.
Because MMA training includes both striking and grappling, it allows you to vary the tactics you use, and the amount of force that you use. MMA doesn't generally include the maiming techniques you speak of. Perhaps if a joint lock is applied explosively, but MMA training normally doesn't include biting, gouging, or skin-ripping techniques. MMA allows one to decide whether knocking the opponent out, choking them unconcious, keeping them at bay with jabs or leg kicks, or simply holding them down until help arrives is the best option. That's because MMA training gives one a broader range of tools to deal with all sorts of situations. This is even demostrated in the ring with fighters like Lyoto Machida and Fedor Emilianenko defeating opponents in a number of different ways, based on what tactics are appropriate for that fight.
I have not seen a study where, through any sort of martial arts training, "mentality may change to attack rather than defend". With all due respect, I believe this is a baseless claim.
"The drills and sparring in traditional arts are frequent, your speed improves very quickly on a subconscious level as you do it regularly." If you replace "traditional" with "mixed martial", the same thing is true.
About drills, multiples, etc: MMA teaches you, first and foremost, the practical, pragmatic side of martial arts. The drills and training methods found in MMA training prepare you for a fight at a faster rate than methods that I've found common in "traditional" martial arts. While MMA tends to refer to the sport competition, I've been in classes and seminars where "MMA" was taught as a means of self-defense, including against weapons. The same training methods were used, just new variables were added. You may want to look into people like Mark Hatmaker and Walt Lysak, and even Pat Miletich and see what they've done with their self-defense programs. And the thng is, with MMA, you don't have to wait four years or whatever until you're a brown or black belt. You can start training this stuff from day one.
Incidentally, a friend of mine trained in MMA was jumped by three guys one night. He used the techniques he learned in MMA, like clinch pummeling, ground-and-pound defense, and the basic boxing cover to defend himself. MMA training gets you used to actually fighting someone. You start increasing the numbers, and it's more of a challenge, but the principles are still sound.
MMA isn't about speed and strength, although like any good athletic program these will be developed as well. Technique is the key, just like with all martial arts. Seeing guys like Frank Mir or Shinya Aoki pull off bizare submissions, or guys like Lyoto Machida or Anderson Silva strike with precission and technique should make that abundantly clear.
MMA takes as much discipline as any other martial art. I've known a number of people who have become calmer, increased their focus, quit smoking, etc. as they've progressed through MMA training. I'm not sure where your idea that it was bullying came from. If two guys or ladies both agree to fight in the ring or the cage, nobody is being taken advantage of. In training, it's a very much like a family, and we all try to help each other out. Even after two people from two different gyms fight, they usually embrace one another after the match. It's all about respect.
If you're fit, you can fight better than if you're unfit. One observation I've made in martial arts over the years is that a little knowledge can go a long way. So six months of training in any martial art will give you an edge up over someone with no training, all things being equal. But why would you want to be unfit? If there's one thing MMA does well, it punishes laziness. It makes you fit. And that is better overall for your lifestyle.
"I also understand the importance of learning two or three different martial arts (not several like MMA)"... just what do you think MMA is? MMA fighters train in two or three martial arts, generally speaking. Lyoto Machida trains in Sumo, Shotokan, and Brazilian Jiujitsu. BJ Penn trains in Brazilian Jiujitsu, wrestling, and boxing. Fedor Emilianenko trains in Judo, Sambo, and Muay Thai. Jens Pulver trains in boxing and wrestling. Marcus Davis trains in boxing and Brazilian Jiujitsu. Kid Yamamoto trains in wrestling and kick boxing. Anderson Silva trains in Muay Thai, Brazilian Jiujitsu, and Taekwondo. Most MMA fighters have been training one discipline since they were children, and being something of an expert at that, expand into the realm of what they don't know. That sounds like what you're recommending. So I can't really tell what you're getting at here.
I'm not sure where your perception of MMA comes from, but it seems colored by vast amounts of misinformation. MMA and its many facets are far from perfect, but you're talking like someone who's entire knowledge of the subject comes from seeing a few clips on TV, or reading what a non-MMA person has said about it. I hope the information I've shared has helped you better understand what MMA is all about. I would suggest that you stop by an MMA gym and train for a little bit. Who knows, you may even *gasp!* enjoy yourself.