Actually it wasn't failure at all.
The Sheriff's Department had an agreement with Broward County schools to NOT MAKE ARRESTS. The Campus Deputy would have had to violate this agreement if he tried to stop and arrest the shooter.
Yes. Correct on every point.
This is why I can see how the following phone conversation could have taken place.
PETERSON: Sheriff, there’s an active shooting occurring. What do I do?
ISRAEL: Calm down, Scot. Don’t do anything to endanger our agreement with the school. Remember they will lose money if there’s a incident on campus. And out crime rates will go up. Hold on - I’ll get right back to you....
(Meanwhile Cruz is killing away....)