The problem is that it is hard to identify who is going to carry out these attacks.
Probably the only one looking in retrospect that had no clear signs was this Stephen Paddock oddity.
Now this particular one in Florida and most all other like it have clear signs,
- No one was surprised it was him, that is a problem
- The FBI was warned, twice, nothing happened, bigger problem
- He had years worth of signs that were neon flashing signs if you will, what else can you ask for?
The attack itself is unpredictable timing and method wise as is any attack, action and reaction, but the behavior profile won't get any more overt than this kid was.