Silas: Ah, so the US soldiers in Iraq are cowards because they shoot people instead of arguing intellectually with them?
Rationality is not the default state of a human being. It requires an effort just to get a human mind to the point where it perceives a scary duty of argument. I have no evidence that the 9/11 attackers got to this point, so I have no evidence that they were scared enough to be intellectual cowards.
Silas: Ah, so the US soldiers in Iraq are cowards because they shoot people instead of arguing intellectually with them?
Rationality is not the default state of a human being. It requires an effort just to get a human mind to the point where it perceives a scary duty of argument. I have no evidence that the 9/11 attackers got to this point, so I have no evidence that they were scared enough to be intellectual cowards.