Ctrl+F Hitler, ah, there it is. I feel like the xkcd comic missed an opportunity to have a 1932-1945 segment in there about the biggest cause of death for time travelers being OTHER time travelers killing them before they can successfully go back in time and kill Hitler, lol.
Re: conservation of reality, I feel like if I went back and shot Hitler, I would miss, or be stopped by security, or bad weather, or my gun would misfire, or even if I managed to actually do it, he'd be replaced by a look alike, and then it would turn out the guy we always thought was Hitler was actually just an actor, or something. Like if someone went back and killed baby Adolph when he was six months old, the parents would adopt another kid and name IT adolph, and there you go. Whatever happened happened and can't be undone, not through magic resuscitation of a corpse, but through smooth and natural intervention of reality itself, if that makes sense..
The pseudo-realism in those batman movies and comic book movies in general is a huge part of why I detest them. It's like an uncanny gap or something. Comic book characters are inherently ridiculous and absurd so I can't take them seriously. They ask me to suspend too much disbelief.
One specific example from the batman movies is at the end of one of them, I forget which, I think a few hundred cops charge a bunch of guys with machine guns or something? And I remember thinking in the theater they are about to get mowed down World War I style. But somehow they win, they all live, and the streets aren't flowing with a river of blood. You want me to take them seriously, while having absurd characters and situations, and then you put them in situations where they absolutely should be massacred..I just..I'm out..