That's nice but it's not like you're qualified to say who understands what.
Unfortunately we have paid for it and we'll continue to pay for it. Walking away isn't politically practical, and probably not possible, domestically or internationally.
The situation there is largely the result of our one sided and incompetent meddling since we assumed that task from the British. You saying we should stay out of it now only means we should have no say in how what we've enabled turns out. Ideally, considering the current mess, we'll take a more even approach but it's not likely.
If my side, which is humanity, was winning there wouldn't be death and destruction on either side of the conflict.
You saying Gaza had 15 years to grow into a nation is a good example of how you habitually throw out propaganda that only idiots or those very ignorant of the facts would believe.