“Is it possible that a school door was opened on May 24 to let a shooter in to advance an anti-2nd Amendment agenda?”
I cannot imagine that any order like that would not be countermanded before it got down to the school, or obeyed when it got there.
A single person on the inside would be all that was needed. No “order” would go to the school. No one else would know.
Crazy/evil liberals are everywhere.