Incredibly half assed.
Quarter assed even, it's like the writer completely forgot how shit-weak Haruka was when he moved into the forest.
Not.. really...?
I remember that chapter, cos it pissed me off.
He didn't give a single shit.
He
was able to defeat the monsters, and had
done so multiple times before, and he just watched the village get destroyed,
AND LAUGHED ABOUT IT.
He decided the villagers were "
stupid idiots" because they talked to him while he was ignoring them, and then
laughed about how he didn't care that the village was being destroyed; "tee hee, not my problem, lol"
The o ly part the author got wrong here is that the MC actually pretends to give a shit, and is making things up about the village.
He could, but didn't try to, save it; didn't care a bit that it was destroyed.
Now he's pretending it wasn't his fault, and probably just doing so because Market Nee-san is watching him.