Recognizing reality helps keep the expectations of both sides realistic. A false illusion that Jerusalem as the capitol is negotiable doesn't.
+1000000
It actually makes it easier for the Abbas to negotiate. Not now of course, but in the future.
Lets try and put our political views aside. Do you really think Trump is better qualified to make this decision?
Sometimes you need an idiot to do the job.
The world reacts to his decision differently then they would have under Obama/Bush etc. It would've been 100 times worse. The Arab leaders know that too.
Before or after?