Acting on advance information is a TOTALLY different ball of wax. A bomb threat is NOT a lone gunman making random and utterly unpredictable choices. Look, given the time between shootings, he could have gone to a retirement home and done his evil there! There is NO WAY anyone could have predicted HIS choices.
Thank you for that little island of rational thought in the middle of an ocean of second-guessing. Prepare now for a tidal wave of abuse from those who “know better”.