Why? Or how?
The “how” is that the Broward Sheriffs knew it was coming and did nothing to stop it.
The “why” remains unanswered.
I would propose that they knew it was coming and let it happen. That’s “why” for the “Drill” earlier in the day. They were hoping it wouldn’t be bad but if id did end up worse then that is what it is.
Gut feeling, start to finish, this was an inside setup. Just too many plusses for them and their always turning a crisis to their advantage, for it not to be.