You have to give the guy a bit of a break here.When you have a job like his...dealing with evil people and trying to stop evil things from going down...it kind of warps you a bit.Like the old saying goes 'you stare into the abyss sometimes the abyss stares back.' He's trying to stop terrorist doing evil and doing so he some times has to get mean and get his hands dirty.Like he says later it's not a pretty job and he's not an evil person
I hope you know that the agent guy is agitated and strict because his wife was killed in 9/11 and he was talking with her on the phone when it happened. .