If this was the organised terrorist attack we were all waiting for on the 4th of July than I suggest we stop worrying as it was poorly planned and carried out. Sending a lone gunman (no bomb)into a place that everyone knows is on watch and armed is not a real smart idea.
Please ping me when some crime hits the news that this group doesn't think is terrorist related.
The words "random" and "isolated" do not preclude its being terrorism.