Except I don’t want my kids’ broadcast to other people. Plenty of other kids’ parents are just as problematic as the teachers. It takes one family to opt out of this for the whole thing to be moot for that classroom so this wouldn’t work.
Police work is a strawman argument. I’ll give you another strawman: installing cameras in all the bathrooms would prevent abuse in this bathrooms, wouldn’t it? Except all the unintended terrible consequences this plan is bulletproof.
Moreover, classrooms isn’t where abuse happens, by and large. Private offices, bathrooms, locker rooms, are all much more likely places.