You are very right, Mary Anne,
And this is also an issue in Europe: do not humiliate the muslims as they are citizens just like the rest of us and our neighbours and co-workers.
It is important to track those who are responsible and also define to what degree and by doing what action is their responsability committed (after all, someone could have housed a terrorist without any knowledge of what he was planning to do).
However, once we track them all and they are brought to justice, I'm afraid it won't end terrorism as others might succeed them (as it happened so often several years ago); we must also try to understand what took them to initiate such extreme actions and be willing to die. And this might be even more difficult to correct.

Raoul