The only thing I don't get, is why the MC was "told": "Don't do it" (lie to the mom? Tell the mom anything at all?)
Seems like it'd wrap things nicely, and also avoid a scenario where the mom might start irrationally dumping her angst and grief on the MC, and then another scumbag is added to the story. <_<
Anyway,
I also agree about the MC -- given how pandering this story overall is,
Holy shit he actually did it.
I genuinely thought MC was gonna back down at the last moment and it would be a classic scenario of: "MC spares the bully, the bully then gets killed by the follow-up villain to maintain MC's moral purity (read: so that the MC can continue being a pussy without any repercussions)"
Glad to see that the author had some balls to actually let the MC murder his abusers.
You'd expect shit like this to actually happen, like elrorro said.
It's one of those moments, where I find it genuinely incomprehensible, how us as readers (of either LNs or manga) can articulate how "pussy-footing MC, has the world solve his problems for him, just to preserve his moral persona in the story" is a beaten trope that nobody likes, to the point pretty much everyone in the comments verbally celebrate a shounen MC actually fucking doing anything proactive to defend themselves against explicit and egregious evil.
I.E: How the fuck is this not the norm? What, Jap editors force the authors to maintain "the moral purity of their MCs" or something? Even shitty WNs that have no editors? I don't get it.