See something...say something....unless it's a "privileged" muzzie. Don't bother.
“........tried to buy body armor and ammunition and the gun shop turned him down....and called LE.”.......
A bit late for LE to do anything about it. Mateen was already on the FBI’s “watch list”. Seems a bit more “prompt” action was needed at a higher level when a highly questionable individual has made the Watch List.
As a side note: I wonder how long that list is.