Which is why I also said no one wants to. There's certainly plenty of people who know, more than those who don't, but the current atmosphere is very against it. Also, comedy doesn't count. OP was talking about the lack of shonen, which doesn't treat violence as comical, though it can wind up that way ("Teleports behind you" from Bleach, the power-up-yelling from DBZ).
Finally, it's not early 2010's anymore. If a show uses violence it's done in the style of Adventure Time or Steven Universe, where it's extremely poorly conveyed (comes off as floppy, unimpactful. Swords wipe against each other instead of clash).
Issue is the lesson these days is acceptance and discussion, which is ironic because it's something no-one is willing to do. When Castlevania has Trevor fight the corrupt priests, the message is "Do what you can against evil, even when discourse sin't possible." SU meanwhile has the meme of forgiving space hitler after an honest talk and a cup of tea.
Separate from all this, I think the real problem is people have a lot of trouble with conflict resolution these days. When it comes to larger issues, we were brought up to believe talking always works, but it doesn't. You can't just talk to someone, you have to understand their point of view, your own, and the rhetoric both of you are working under. But when one side vehemently refuses to do that, it becomes a problem. And instead of trying to understand the other side, people just sunk to their level.
I was taught to believe in myself instead of think critically, and life experiences have changed that, but a lot of other people still don't really have a lot of introspection.
We don't doubt ourselves enough, so we're uncomfortable with the idea of solutions that aren't perfect. You can't treat punching as a legit solution in a cartoon, because that isn't how it works in real life. And we have so little faith in our discourse that we worry the smallest thing will cause our kids to become murderers.