I think "schools are places that give people of a certain age something to do without giving them the option of leaving" is a perfectly valid sentiment and a go

I think "schools are places that give people of a certain age something to do without giving them the option of leaving" is a perfectly valid sentiment and a good description of why more 10 - 14 year olds would perform less crime. Calling them prisons implies the entire population of students would commit said crimes.