That is weenie talk. In war you use whatever methods result in victory, and the long term survival of America's security and economic interests. Whether it's horses, bullets, bribes, deceit, lasers, bombs, rockets, or whatever -- it does not matter as long as the objective is accomplished with dispatch.
We should not wimp out because of fear of what "discredit" may come from those who love to hate us anyway.
I agree with what he said. Terrorism is only something you resort to when you are too weak and too unprincipaled to use anything else.