The kind of thinking that is dangerous is the line that we deserve to have these things happen - those people deserved to have their limbs blown off - because America's foreign policy is "bad." At that point, you are agreeing with people like Bin Laden and you are just about set to contribute to these kinds of attacks yourself, because you agree with the reasons.

Acknowledging that we live in a material world and there are multiple causes for things is incredibly minor by comparison, and isn't an ideological basis for carrying out terror attacks. Causes aren't the same as reasons.