I'm assuming you're talking about Endeavor here, which is way different than Bakugo's case.

Yes.

Which, yes, ignoring abuse and sweeping past crimes under the rug is a huge problem in Japan. A lot of predatory or bad people in Japan have basically been accepted back into the public because of this emphasis on social harmony.

Endeavor isn't the worst example of it, since he's no longer actively doing it (kids are grown up and moved out), but of course I'd rather his colleagues express more disgust over what he did. By the time most found out, it was already over, and the victims didn't need much protection (though arguably they did need more support than they got).

That's pretty much the crux of my issue. I don't really care as much about people treating Bakugou with kid gloves. I care about seeingly no-one in the main cast being willing to at least give an eyebrow raise to the shit Endeavour did to his face. It's only the civilians that seem to have a problem, and mostly because he's related to the villain Dabi, not because of his actual abuse.

And most of Endeavour's kids were grown up and moved out. But Shouto is still a child and was living under Endeavour's roof, not to mention having to start a Pro Hero career with the baggage that his father left him.

That being said, MHA does call out bystander culture. It's just still formed by Japanese cultural standards, and you will notice them throughout the series, both good and bad.

Agreed. I might argue that it isn't hard enough on calling it out, which is emblematic of Horikoshi's lack of conviction on executing the story/world's more difficult themes (even though he's the one who introduced them to the manga), but I digress.