> you can definitely use school facilities after hours

Aside from a few things like some playgrounds shared with public parks next door this has often been pretty untrue. I've definitely had police escort me off school basketball courts when school isn't in session, the natatoriums haven't had much public access, it's not like the school libraries are open after hours, etc.

I'm sure some places are more open and some are less open, I wouldn't say you can "definitely" use them.