What's the line then? There are millions of conflicts around the world that we can 'get involved with'. Saudi Arabia likes to behead and crucify people, should we 'get involved' with them? What is the number of wars and death it takes to make everyone do exactly what we want them to do?
The conflict in Iraq is special because the U.S. precipitated it. I was against invading Iraq, but once we did it I was absolutely committed to staying there until it was stable. While Saddam Hussein was a monster, like most monsters his grip on power provided a good deal of stability. Removing him also removed that stability, so we had a moral duty to stay there until a comparable level of stability was restored. Unfortunately, a majority of the U.S. just wanted out quickly regardless of stability and the consequences, and elected a President who promised just that and delivered. What we're seeing now with ISIS is the consequence of shirking our responsibility to fix what we broke, and not withdrawing from Iraq until it could provide its own stability.
Did you know ISIS was born of intervention policies from the U.S. government? The reason why they are even around is because we are involved.
Did you know U.S. inteventionist policies were born from Muslim acts against the U.S.? You've probably heard the opening line of the Marine Corps anthem:
From the halls of Montezuma, to the shores of Tripoli...
The Montezuma part makes sense. The U.S. fought several wars with Mexico, so of course the Marines would be involved. But Tripoli? That's way over in Libya (that's Africa for those weak in geography). What the hell were U.S. Marines doing there?
Funny you should ask. Way back in 1800 when the U.S. was a freshly minted nation, it ran into a problem. Prior to the revolution, the U.S. was a British colony, and thus fell under British protection. When the U.S. gained independence, it lost that protection. The Muslim Barbary States decided to take advantage of the situation and began capturing U.S. merchant ships and holding the crews for ransom. Their thinking was that since these people weren't Muslim, it was ok to kidnap them and extort a ransom.
The fledgling U.S. had its own domestic problems and didn't want to meddle with things going on in other countries. But it didn't have a navy which could deal with the situation, and attempts to negotiate a treaty with France to protect U.S. vessels fell through. So for the first few years, the U.S. just paid the ransom. Of course paying criminals just encourages them, and it became open season on U.S. flagged vessels. Eventually the payments became exorbitant, and the U.S. recommissioned a navy. President Thomas Jefferson (y'know, the guy who wrote famous things like, "We hold these truths to be self evident - that all men are created equal") launched a military operation to Africa to end the kidnappings and free the hostages.
That is how the U.S. Marines ended up in Tripoli. That is how U.S. meddling with foreign nations began. Because a bunch of Muslims decided to take advantage of a fledgling non-Muslim nation by kidnapping its citizens and demanding ransom for their freedom. So if you want to play the blame game, the first incident, the precipitating act which began over two centuries of animosity, was actually committed by Muslims against the U.S.
I've got a bad feeling about this.