ISIS is chiefly concerned with butchering anyone, regardless of civilian status, to gain, and maintain through fear, power in a region.
Hmm, who does that remind me of? Israel? Yes, that shining beacon of democracy that gets almost unlimited weapons of mass destruction from the US to kill a majority of unarmed civilians.
And btw, the US may have "laws against targetting civilians" but it doesn't mean these laws are followed. There are ample records of this.