I haven't seen Joker. But I'm sort of finding myself agreeing with you. Does that mean I'm getting old? 🙂
I do think it's a little different today. Maybe I'm just being nostalgic. But the violence in those films had a narrative purpose. There was a moral, or at least some meaning to those stories. I'm not saying all movies need to be art with layers of meaning. Lowbrow entertainment is OK.
I watched the 2nd John Wick movie a couple days ago.
I got kind of bored with the endless (nicely filmed, well choreographed, implausible, subtly impregnated with product placement ads, but most of all endless) fight scenes where a couple dozen guys get murdered by a protagonist the audience supports and cheers on.
I finished that movie thinking, wait, was there someone in that film I was supposed to like or respect, aside from Keanu's dog? I'm not exactly squeamish, certainly not anti-gun, totally OK with the role of violence in art and entertainment, but ... WTF? Keanu Reeves is an irredeemable evil POS in this film, and the film unapologetically, non-ironically, genuinely presents him as the protagonist. I'm not sure when exactly that kind of film making became cool, but it was after the ones you listed.