I never noticed that. It is weird. But to be honest, I never had a problem with Batman killing people. And I'm not just talking abut the movies. Just think about how many lives he could save if he would just kill the Joker. What doesn't sit right with me is when he dies it with a Smile on his face like in Batman Returns when he shoves that bomb in the fat clown's pants and pushes him down the shaft or whatever that was.
That one always bothered me, even as a kid. Like, no body saw the GIANT marshmallow monster trashing the streets of New York? The entire city turned their heads in unison? Even if you're the biggest anti-supernaturalist it is pretty hard to find a rational explanation for this one.
Iron Man 3
Harry Potter - Deathly Hollows
Edit 2:
Terminator 3:
How come all the events in Terminator 3 still happen? All the chips that served as a template for or inspired them to create Skynet were destroyed, the guy that came up with Skynet is dead and I doubt that they could create smoething like Skynet just from that part of the arm that was left behind. It was established that Skynet was reverse-engineered from the CPU. So theoretically Skynet doesn't exist. But I guess we could shalk that up to "nobody ever got time-travel right".
Avengers:
When did Bruce Banner learn to control his anger? The whole movie he was scared about not having control over himself once he turns into the Hulk. That is why he lives in exile. At one point he turns into the Hulk and nearly destroys the airship. But just before the final battle he says something about always being angry or something like that and suddenly he has full control over himself. What happened?
Edit 3:
The Dark Knight
For someone who according to his own words doesn't have a plan, Joker seems to be working on a very thight schedule. Also his crew of Arkham Asylum inmates who all are supposedly insane seem to be strangely dependable.
The Dark Knight Rises:
Why didn't Bane and Talia just blow Gotham Up the second they get control over the nuke? And how does Batman survide the blast and the radiation of a nuke? With only like 2 seconds left on the timer it is impossible to escape. And why isn't Blake blind despite staring right into the explosion? And why isn't Gotham a Fallout-esque Wasteland? And what did Blake ever do to deserve to become Batman? How could he figure out that Wayne is Batman just by looking at him? Why is Officer Gordon suddenly retarded? I always thought that he probably had it figured out (remember that scene after Bruce saves Reese from getting killed by running a red light and raming a care that was about to ambush Gordon's plice truck?) but didn't care because for him Batman was a symbol. And then comes that one scene before Batman flies away to sacrifice himself. By that point everyone and their dog know that Bruce is Batman. Which makes it even more painful to se Gordon walk up to Batman and ask "Who are You?", And why didn't anybody think it was a bad idea to sent the majority of the policeforce into the sewers? And why did Batman after becoming a Howard Hughes-like recluse because Rachel died forgot about her so easily and fucked Talia? He locked himself away for 9 years and after Alfred makes a claim that he can't even back up with evidence he simply forgets about here and fucks the next girl that he come across? I knew that this would happen, but it happened so fast. This should've been a huge part of the movie but instead they spent like 15 minutes on it and move on. They never even mention again that Alfred HAS LEFT THEM! Bruces father figure, the man who always know the right words to say at any occasion, leaves and apart from that one moment when no one opens the door he doesn't seem to care. And did they have to do the Talia plottwist? What was the point of that other than pleasing all the comic-nerd that knew who Talia was? Her character added nothing to the movie and was in it way to little for me to care about her and that twist. And in the end it didn't change anything. And it robbed bane the chance to be anything more than a gloryfied henchman.
I know, wall of text. The strange thing is I still enjoyed that movie...