You mean the opposing forces who have no regard for the Geneva convention by which we hamstring ourselves?
I'd agree with you if we were willing to unleash the FULL capability of our military, but thusfar it seems that we are not.
The Geneva Conventions have very little to do with unleashing our capabilities.
The Iranians and the Syrains are quite aware of what we can do to them if we so desire. That knowledge is reining them in greatly already.