You've already said that you don't care about people in other countries.
I gave you a reason and you chose to ignore it. Another reason is that it's a step towards conflict resolution. The status quo isn't working and things need to move forward at some point. Another reason is that we have a diplomatic presence there for Palestinian relations (The US Consulate General in Jerusalem). Recognizing Palestine but not our strongest ally in the region makes no sense. This is also a show of strength and a statement that we back Israel's claim to Jerusalem. That's important, unless you're an appeaser.
Your sensationalized armchair tale of Arabs and Muslim nations all becoming irrational over this is not the self-evident fact you believe and portray. It's also degrading to those peoples and continues to deepen this condescending view that they will react irrationally. Saudi Arabia, for example since you mentioned them, is our ally and this embassy isn't coming close to changing that. They don't need to publicly kiss Israel's finger ring. The royal family isn't going to change their tone based on a symbolic embassy move. Arabs and Muslims are people too and they will think things through.
You didn't give me squat originally.
How do you feel this aids the Israeli/Palestinian peace attempts?
http://foreignpolicy.com/2017/12/08...cision-sparks-day-of-rage-across-middle-east/
http://www.jpost.com/Middle-East/Thousands-protest-in-Jordan-burn-US-and-Israeli-flags-517463
http://www.straitstimes.com/world/middle-east/worldwide-protests-over-trump-move-on-Jerusalem
Yup, looks like it is going swell.
But hey, that's enough with trying to change the discussion.
This doesn't help us and you have yet to spin a yarn about how it will. That is what this post was about.