Don’t say that. When confronting Breivik in Norway, he was opposed by squadrons of highly trained office workers trying to paddle a zodiac and waiting for a heli pilot to show up.
Eventually he got bored, stopped shooting and waited for arrest (and the press).
Breivik is the exception of mass shooters....he has been determined to be totally sane. He had a motive behind his episode, and it may take fifty years to determine if his theory is correct.