We DONT know, thats the thing, but if we have strong evidence, even if it might be wrong, we are still not gonna leave it to chance. Were gonna find out if this guy knows any thing. If he doesnt, im sorry but mistakes are BOUND to happen. Remember this is a war, not a conventional one with big masses of armies in uniform but a WAR nonetheless. Civilians are ALWAYS caught up in wars. Im NOT justifying it, im saying that it is going to happen no matter how hard u try to avoid it.
IF you are going to torture someone you had better be damned sure the guy is guilty, has the information you need, and that NO OTHER way will yield the desired results.