So any place where there is violence from the state or a state-like actor against people is a good target for US intervention?
I don't disagree it is a breeding ground for terrorists, but Osama bin Ladin's entire point for 9/11 was to bleed the United States of resources at home and abroad through their response. His goal was not just to win 9/11, it was to win the decades thereafter by declining the US. Now obviously all of his strategic goals weren't realized, but which of our strategic goals were realized? That Osama is dead? That Sadaam Hussein is dead? Really?
Respectfully, I think you're giving OBL a bit too much credit. And you haven't set forth any counterproposal to stopping the spread of ISIS. This campaign is kind of like treating a nasty cancer with chemo - it sucks, and there's at least a 50% chance the cancer will come back - but it's at least worth trying.
My counter-proposal would be to encourage the regional powers to do something, coordinate intelligence with them and try to bring them to the table. From the perspective of a Kansan, I'm not that concerned about the threat of ISIS as it relates to me personally. I don't think the US has nearly as much of a strategic interest in stopping ISIS as you do and they would be better served motivating the regional actors to do the work, as they should have a much more vital strategic interest than us.
I don't think there is very much evidence that humanitarian interventions work well minus a clear humanitarian case, a NATO coalition, a NATO/UN mandate and lead by the US or NATO partners. The track record is terrible. The fact that Obama cited Yemen and Somalia as his examples of this "containment" by drone and those are both disasters. It has absolutely failed on its own terms: there has been no elimination of the terrorist threat in either nation and the drone attacks have in many ways made the population more antagonistic. Keep in mind, this is with the full cooperation of a partner government in the case of Yemen. Do we expect Syria or Iraq to cooperate to that extent?
You have stated that you think it is important for us to meet the war that has already been declared on us. But to what end? Blow up some crap is what you've said when asked for specifics. That is not a strategy.