Posted in the latest chapters comments but guess I'll also bring it here.
It's crazy to me how people are getting so bent out of shape over this new arc. Yeah the new girl is a bitch but that's kind of the point; she's an antagonist, a source of conflict. Yeah her inclusion brings drama but also some potentially fantastic character development for Unoki and even more potential of that magical "progress" that everyone loves to go on about like it's the only thing that matters.
In regards to why Toramaru and the others stood down I have something of a theory. While their status as delinquents is acknowledged and we know they do get into fights, outside of perhaps Toramaru's knocking down of Matsuri I'm curious if they've even done anything besides throw their weight around or act menacing.
They get into fights outside of school but never on school grounds and in a way that there's hardly any proof of who did it.
Here, however, we have a case where a girl openly witnessed being chased by Toramaru ended up with a head wound. If this is in fact their first witnessed act of violence on another student this could lead to serious repercussions both in school and legally.
I think reputation isn't the best way to put it, but it's more in line with they don't actually want any solid evidence that can get them expelled or worse.
I'm looking forward to where this takes the series.