Alone? Sarcastic? Or genius?

Usually I find it very hard to write about something, but this time the idea came just by watching TV...
Tuesday evening 20:50... My favorite TV series "House"... after that a new and pretty interesting series "Lie to me".. usually it was "CSI Las Vegas, Miami or New York" at that time or "Shark"... I don't know why, but I realized that there is one common thing in all these films - The leading actor is genius in some way, but he is always alone, unhappy, or just hard to stand... Why is it so?

For example:
Dr. Gregory House - super cynical and sarcastic medical genius who is somehow unhappy and alone deep inside. it seems, that person has to be an ass-hole just to be perfect in detecting unthinkable diagnosis!
Lt. Horatio Caine - super protective, clever and honest policemen, who keeps the reputation of his team and the idea of justice alive. Alone, has lost his wife, in love with someone he can only dream of (colleague)...
Gilbert "Gil" Grissom, Ph.D. - Super analytical crime investigator whose work you can only admire. Alone, in love with a colleague (again!), because of whom has to leave his excellent job...
Detective Mac Taylor - keeps fighting for the reputation of his team, excellent detective, but also - has lost his wife and in love with colleague (again!!!)
Sebastian Stark (Shark) - excellent prosecutor with wonderful thinking... Alone, however has a daughter who lives with him... (progress?)
Dr. Cal Lightman (from "Lie to me") - newly seen personage in this list... What could I see from the first series? Genius with excellent skills of knowing people! However - alone..., divorced.. with a kid...

I could continue more and more... With John Rambo (alone, excellent soldier and killer, unhappy, because his beloved woman was killed), John Matrix a.k.a. Commando (Retired soldier and single parent, and of course - perfect killer), Dr. Evil (maniacally oriented terrorist, single father) etc., etc., etc....

Is it really so, that a man has to be an unhappy, sarcastic killing-loving jerk just to prove that he is genius? Or are these symptoms the result of being genius?

I think all of this proves that there are lots and lots of people who sacrifice their private life just because of their work... And for sure, I don't wanna be like them! Because I don't want to be a slave of my work and I want to enjoy my life.. With someone...

Somehow I mentioned only men... however I sometimes feel that there are more and more women as well, who are just like these guys I mentioned above... Unfortunately!