Re: Middle East always ready to kill each other. This is the way..
The entire area is always in tension and always has been. It just takes an accidental wrong word or someone running over someone's line in the sand. A minor scuffle occurs and it ends up as a new balance where they hate each other.
That's a bit of a trope tbh.. there are longstanding issues/rivalries both with borders and ethnic/religious tensions.
The Iraqi invasion of Kuwait was in part the result of an ongoing dispute re: directional oil drilling over a shared oil field, the Saudi/Iran rivalry is a longstanding, deep sectarian issue, it's not some trivial event that has caused them to hate each other.
Likewise borders such the lack of one for Kurdistan (a stateless people) or indeed issues re: the state of Israel and it's expansion/settlements into Palestinian territories are not exactly minor things either.