[vxNsr]

No part of the internet can be considered “low crime” least of all a school system.

If you have an isolated network that is truly airgapped from any other network then and only then is it remotely acceptable to “leave your doors unlocked”. This doesn’t absolve the criminals who deface/destroy/steal your PII/data but rather you’ve got to adapt to the times.

[watwut]

The point is, the person who went through those front doors really don't get to blame owners for not locking the doors. Sometimes the line is fuzzy, yes.

But in situation described above, it sounds like it was not fuzzy at all.