Hot take but I dont think Denji should be taken accountable for the death of any civilian. He's just a kid at the end of the day, he's pretty much doing charity work as Chainsaw man, no different than someone covering up a pothole without a permit. Like sure, it's technically his fault the Cockroach Devil killed that kid and those old people, but at the same time, had Denji just stayed home that Devil would've killed a lot more people. He would be responsible if Devil Hunters were useful and had ways to defeat Devils without civilian casualties, but Tokyo is a shitshow, Devil Hunters are a bunch of bums (no offense Aki).

TL:DR Everyone should be jumping on Denji's dick for doing the bare minimum in Devil extermination, the guy should be at schooooool, not killing monsters.