If Mark Wahlberg had been on one of those planes that was hijacked during 9/11 he would have stopped it!
No. He would have instead attacked any innocent and defenseless passengers within reach.
From Wikipedia:
At 16, Wahlberg approached a middle-aged Vietnamese man on the street and, using a large wooden stick, knocked him unconscious (while calling him "Vietnam f*cking shit"). He also attacked another Vietnamese man, leaving him permanently blind in one eye.
In another incident, the 21-year-old Wahlberg fractured the jaw of a neighbor in an unprovoked attack.