Imagine you are digging a hole. You have your reasons for digging this hole and you explained your reasoning to everyone who has partial ownership in the land where the hole is being dug. No one is quite sure why you started the hole, but at the time you started, everyone trusted that you had your reasons for digging the hole, and that these reasons were honorable.
Unfortunately, nothing that you told them that was down there was actually there. You dig and dig and nothing shows up. Before long everyone thinks you're searching in vain and tries to convince you to get out of the hole and stop digging while you are still close enough to the top to get out. You ignore them and continue to dig your hole. Eventually you're just the idiot still digging a hole that goes nowhere all the while depleating the land of valuable resources and beauty.
Your reason for continuing to dig and for getting even deaper into the hole?
You don't want the terrorists to win.
So just keep digging. We'll show them.