Sounds a little like that punk Nicolas Cruz in Broward County, FL, who’d had numerous brushes with that county’s sheriff’s office, yet that lazy, fat-assed “sheriff” couldn’t put 2+2 together enough to head that guy off. Here, we have slovenly cops and FIB types who couldn’t bother to check this more recent guy out.
Don’t forget the San Bernardino shooter.
Agents knew it was him before he even stopped firing.
Same with the Orlando nightclub killer.
All known before hand to the FBI.