There was no established history in the other movies.
By the time I found out Joker was responsible for Bruce's parents murder. I had already had a certain attachment level to the character. I was already having too much fun, to truly have a certain level of hate for him.
I was too amazed and caught up with the Joker to care/hate him by the time Rachel died. I only cared about the Joker's next move. I only cared about his next philosophical viewpoint.
In this movie universe. We know (or at least can assume) he tortures Harley Quinn. We know he brutally murdered a Robin. He may have even did terrible things to Barbara Gordon. Its already been expressed that this Batman that we're meeting for the first time has already gone through hell. This isnt the badass silent type Batman like Keaton. This isnt the hopeful Batman like Bale. This is the 20 year run Batman who has been put through hell by rival.
The hatred is already established and they're not just figuring each other out.
I think and assume that BvS will establish those reasons to hate the Joker. I think SS will reaffirm why we should hate him.
This established history/hate preps me for the eventual confrontation in a Joker/Batman movie. I'm assuming a lot. But I believe these filmmakers will do a good job of pulling this off.
Ok so you're saying it's all assumption, because in your last post you were saying this is the first time you've wished to see Joker beaten, and that's without even having seen anything substantial yet. Which is why you saying that stood out as woefully premature to make such a declaration.
You're right you are assuming a lot. For all you know Leto's Joker might be just as likable and interesting to you as the previous Jokers that you won't give a toss if he murders 50 new born babies, let alone that he killed Robin, or tortures Harley.
Both previous movie Jokers were giving audiences reasons to find them hateful loathsome characters. I'm not talking about the contrived killing Bruce's parents, or Rachel being killed. They were psychotic killers who were murdering innocent people by the truck load, and getting sick kicks out of it. Not to mention Nicholson's Joker mutilated his gf's face, and Ledger's Joker mutilated Harvey Dent and twisted him into Two Face. Why are these acts less worse than killing Robin or torturing Harley?
I'm not saying Leto's Joker can't or won't be a hateful creature, but your reasoning can be applied to the previous movie Jokers whom you say you were rooting for over Batman. There's every chance you'll find Leto's version just as likable and interesting as you did Nicholson and Ledger. If you could overlook their monstrous acts then I don't see why you can't with Leto's. Shouldn't make any difference that he's already got an established feud with Batman. Especially considering we've seen nothing of it. Just saying they have a history is not enough. The onus is on the movie to make the audience care about that and believe it, and that takes screen time and development. And in the course of that you could find yourself so charmed and amazed by Joker that you'll be loving him more than Batman.
That's all I'm saying. Btw regarding Batman, I haven't been following Affleck's character or BvsS much at all, but do we know for sure he'll be nothing like the previous Batmans like you say, or is this just more assumption.