You have the greatest moral responsibility. Sure, Burke and Tenpenny aren't good guys either, but you set in motion all events leading to trigger the bomb. I kill Burke before he has a chance to kill Simms, or the other route, I just disarm the damn thing and let the hit squad roll.
Agree, your the trigger man (litterally). You not only set the charges but pushed the button.
Tenpenny may be senile, as the impression I got was Mr. Burke told his boss Megaton was structurally unsafe and would be evaucated before blowing it up.
I'm wondering why Burke just waits around Moriartys in the hope that a complete stranger will turn up who might want to press the button. Surely it would be quicker to do it himself? Unless he's either more moral than he seems and doesn't want that on his conscience or he just enjoys corrupting someone. Strangely I've never thought about this kind of thing on previous games
The most likely reason Burke won't do it himself is he doesn't have the necessary explosives skill and if he's caught tampering with the bomb he's likely to get shot in the back of the head. Even if he's successful its possible someone who left Megaton before the explosion could remember Mr. Burke tampering with the bomb. So in short why take any risks himself? Its not like Megaton is a threat its just an eyesore he can afford to take his time
Also according to the offical game guide, Andy had been negotiating with Mr. Burke about blowing up Megaton inexchange for moving the bar to Tenpenny Tower. (and its just as likely Andy has no explosive expertise either). So it could simply be he's waiting to finalize that deal but if a better agent should show himself that's fine.