lol wtf are you all complaining about, this whole manga has led up to this kid losing his mind and forgiving his mom no matter what after years of abuse
Kid being mentally ill from his experiences of being abused, sure. I did get the vibe with the "fuck u mum im gonna beat your pillow face in" that he was skipping a few steps but that's not really my problem here. They could go somewhere with that story and still have it as "I get you're not a 2D supervillain but obviously you did a lot of damage and can't be in my life anymore, see: attempted murder" in the end and him making his peace with it.
This isn't it. The problem is to get there they've instead gone "haha wat if the abused child was the real bad guy lol" after displaying a perfectly indepth "holy fuck she's abusive and smothering him" for way up 'til now. The 180 doesn't add layers, it's like "oh I need a twist uhh, I'll retroactively decide Good Guy was the Bad Guy all along, they'll never see it coming because there was no hints or foreshadowing, plot tweest".
It's a pretty hokey victim blaming narrative in contrast to what was excellently portrayed up 'til now (That he what, made her abusive because he was smothering her as a little kid and egged on a grown ass adult into murdering her nephew and... wouldn't quietly die when thrown off a cliff as a toddler?) and the whole scenario seems contrived to go "haha you Did The Thing too so now you can't criticize her! badguy is gudguy=depth rite?". It's weak.
Anyway, still a few chapters before we see what's actually going on I suppose, author likes his unreality segments.