You could say that about anything.

"we had to shoot the minivan because in Iraq these have had bombs in them."

"we had to shoot that kid, because he may have had a bomb in his backpack."

"sure, that lady just had to die. She may have had a gun. Who could have known it was just a remote control?"

The reality is that the people shooting are helping kidnappers, Nazi's, and generally evil people. Of course they aren't going to show patience or civility towards civilians. That's not why the president has injected them into that situation.

They are military, and they are there to wage war on Americans.