To keep their resident populations under their respective despot's thumbs, what else.
You seem more upset over a tragic event in 1967, than 9/11 and its 3000 dead, along with the consequent war on jihadists.
We've taken causualties from all sides since our decision to involve ourselves in the Middle East's wars. My question still stands - what have the billions of dollars spent and thousands of lives lost actually gained us besides more wars?
They would destroy America and all of Western civilization if they could.
BUT, they can't. Indeed, they can't even destroy little Israel. They didn't start fighting us until we elected to jump into their wars. That's an inescapable fact.
BTW, I have always thought that whoever ordered the attack on the USS Liberty should have been hanged, but I'll bet that is not your real issue.
They could have started with the mf in the WH who called off the carrier air support.