[PhasmaFelis]

They're not blaming the teacher for keeping their mouth shut, they're blaming the teacher (or administrator) responsible for putting kids and convicts together on a work project.

[papln]

I read it as blaming the teacher for not explaining the situation, especially regarding weapons. There's nothing to suggest that the prisoners and the teens would have any trouble getting along.

[darkpuma]

Maybe some parents don't want their children getting along well with prisoners.

I probably wouldn't mind it, but I would certainly want to be asked first.