I mean, that's all well and fine. They're not interesting to you. But you said they were simpletons with an overdeveloped sense of justice. That statement is simply not true.
I think "my parents died and I want to avenge them" is about as simple as a character motive can get. Can you think of a simpler one?
Tony Stark is a drunk because of the validation he's seeking from his late father.
Aaaaaand?
Batman's issues are more than that. He has all the resources in the world... yet he fights criminals in the shadows? Alone? As a crusader? He could literally change Gotham with his money alone, but he instead chooses to pump millions of dollars into being a vigilante simply because he's allowed one tragedy to run his life.
More likely, he's a comic book character that fights crime, and no one would buy the comics if he actually cleaned up Gotham city. Comics are long, long past the point where they can be respected for character development. Their authors don't even take them seriously. Though I am admittedly speaking more about Marvel than DC here, since that's what I'm more familiar with.
And, once again, if we want to go at this from the deep angle... what's so appealing about the innumerable villains in the Marvel universe? Their superpowers don't make them deep. The majority have the motivations of cardboard.
I'm not attracted to the innumerable villains of the Marvel universe, so there's no need to argue that point. Even moreso because like I said, I was judging the characters based on how cool they are initially. Enzo and Dahbomb wanted to approach things from the character depth angle, not me. I don't expect character depth in mass media, it's just not fair to modern sensibilities.
I don't have a hard-on for villains, contrary to what people here might think. I like characters who pursue their goals honestly, by which I mean they say "I want that", and then they take it. Straight forward. There are rarely heroes who go about doing these things, because they are mucked up by concepts like justice and morality. Characters like Firebrand and Morrigan are appealing to me because they are honest about their drives: they're instinctual. What heroes are so honest as to say why they really do what they do?
To make heroes even less appealing, they can't even justify their own existence. They
need villains to be heroes. No one gives a fuck about an Iron Man or Captain America in a world filled with peace. Iron Man would be a noteworthy inventor on par with Albert Einstein, but he wouldn't be what he is now. Captain America would probably be a construction worker or something (who knows). Heroes define themselves through their opposition to villains. The villains drive the story through the expression of their desires.
A character like Chris is maybe the best (worst?) example. What is Chris without a Wesker to catch? That's all he can yam about. All of his lines are even him complaining about Wesker or taunting him. He doesn't even exist without his end goal, to kill Wesker. He's pathetic. Wesker would be Wesker without Chris. He would still be a madman bent on creating a new world. Even when heroes have backstories to make them feel more real, their entire existence is still noteworthy only because they have an obsession with eliminating the "bad guys".
One of my best friends is a clinical psychologist and his favorite superhero is undoubtedly Batman. Followed by a combination of Iron Man, Thor, and Captain America.
Bad taste exists within all professions, as does intellectual uncleanliness.
You might have read psychoanalytic cases but I have experienced them in clinical practice. The cases of Batman and IM are still very interesting to me, especially Batman. Batman is over avenging his parents, he had his chance but didn't follow through (if you want to follow Nolan Batman). If this was just vengeance he would be done a long time ago. He wanted to strive for something greater, for what he believed true justice was. The stuff that he has to deal with on a daily basis (psychotic killers) it's a miracle that he hasn't started killing them off one by one. It is certainly within his capacity but he is well beyond that.
Boiling down Batmans character to just one event in his life is under selling him. It's like saying the only reason why Magneto fights for mutant rights is because he went through the holocaust. These are catalyst events but they are not enough fuel to keep them going for as long as they have.
I was responding to the neurosis angle with regard to Batman's character development. Undoubtedly, other stuff has happened to him and influenced him.