Why are we there ?
Should we be there ?
Why are we there ?
To take oil and gas cheaply, destabilize the region and build up ISIS through funding rebels to topple other government heads like Al Assad.
Should we be there ?
That depends
If your pro Israel a weaker middle east allows it to expand its territory with relative ease.
If your job is in the military and you get work for building weapons to fight then there would be no jobs see American budget on military spending, and the idea of war investments for peace.
If your trying to create peace in the Middle East
(NO you'll only make it worse killing the dictators there they are what creates meta-stability in that chaotic environment destroying them creates a serious power vacuum where more radical elements moderated by these dictators can now thrive in)
And if your a corporation less government to deal with less tax = a better bankroll, hiring a few thugs to keep an oil area safe is cheaper than taxes on production.