Yeah, it's his job by default, but he might not be good at it, and I'd rather he doesn't have to be the bad guy. Just
make one person ultimately responsible to be the "nope, you need to figure that out better" guy. Then there is no diffusion of responsibility; he knows he can't rely on anyone else to make the right call. Which is what I think is probably what parents did in this case. "I'm sure they're making sure it's all safe".