Everyone might complain that the uke picked the wrong decision, which he did but the logic and reasoning is there! People clearly forgot the knife to the gut the seme gave him at the end of ss1…. I think that stab actually finalizes his decision on not reporting his “mother”, thinking he somewhat payed back her crime whereas she only had 3 months to live so all is well. 10 days coma (still in dazed) + waking up heard everything ended with the perpetrator/victim running away + the brother suggest a “start a fresh life” option = his decision.
Keep in mind that the talk with his mother is in the same night and the talk with his brother about what is the best approach to someone who obsessed with you is recently, I can see why he got frustrated coming home to his house being trashed with someone trying to commit suicide to force him for answer on topics that he was still indecisive. This must be why he blurted out he doesn’t care anymore because at the end of the day, he is still a human, having flaws and making mistakes.
The only horrible thing is that the uke still looked at the seme as a kid, so only the bare communication attempts was made. Considering how the uke didn’t report the seme arson, I would assume the same logic was applied to how he thinks he can help the seme without having him going to jail with therapy involved. Bad idea but anyway. Hope we will have a closure on ss2, with the starter of the “mother” being punished severely before the foreshadowing rape in chapter 1 happening………