The occupants of what we are now calling the Middle East (it used to be called the near East) have been fighting each other for thousands of years. The addition of Islamic holy wars are somewhat newer than that, having started around 600 CE.
How many American kids should die trying to sort out this mess?
I find it interesting that a lot of democrats oppose American military involvement in this mess except when its a Republican tryiing to stop it.
A few comments to answer quesitons in advance:
I did not vote for Donald Trump and I won't vote to re-elect him.
I think we should build a fence around that part of the world, and tell everybody inside it that they're free to settle their differences any way they want. Then we'll try the survivors as war criminals.