Yeah, kind of my point was that y’all are viewing it as a “field trip”, which is typically a specific event that’s infrequent, carefully organized and supervised, which is a whole different beast to the generic standing instructions of “we’re not going to supervise your kids if they wander off school grounds” slip.

For the former case it’s pretty much understood that everyone in class should be able to join a field trip, but for the latter it’s not unusual for parents to decline and therefore teachers would absolutely be expected to enforce the rules.