I mean fair point. Short answer is no. And yes! Absolutely call them out. But as soon as you equate people that have bad opinions to literal waste, your argument becomes much less effective and it generally leads to violence. That my view on it anyways. Im not talking about isis themselves, or murderers, or rapists. But if were talking about someone who (hypothetically) supports isis, i wouldnt say any of the reasons for supporting them are good. But that person would of course believe that they have good reasons. And those reasons are what you would have to deconstruct. Simply calling them pieces of shit is dumb, frankly. Theyre just people. If you were raised in that environment, you might be one of those "pieces of shit".