If you spend a few moments on LiveLeak looking for IS videos, I suspect you'll come to agree that "IS" (or "ISIS") is a thing distinct from "terrorism". As not an apparent, imminent threat to the US, I'm not sure whether they deserve more or less attention [from our population's eyeballs and thereby our military's bombs] than does "terrorism", but it's hard to agree with the cynical interpretation that "IS" is merely a rebranding of the terrorism bogeyman.

...and I would advise you against spending those few moments on LiveLeak looking for IS videos...