Your concern is touching, in that usual bad touching sort of way.
Ejection of diplomats is a common way for a country to express displeasure with another. It's been that way for hundreds of years.
We already have an imbroglio with the Russians over Ukraine & Syria.
The US & the rest of the world have never granted Israel the right to dispossess the Pals. Our Israeli friends have lied to us every inch of the way wrt "seeking peace" & the two state solution. Their actions wrt settlements & now Bibi's own words reveal that to be true. Trump's new ambassador to Israel & Ivanka's father in law have long supported the most radical settlers. Friedman recently offered this-
http://www.haaretz.com/israel-news/.premium-1.726779
Of course Obama let the UN resolution pass. He has to put this squarely on the Trump Admin where it belongs wherever it goes. Trump has to brand it to do it. I'm sure he will.
Syria? Wut? Trump told the Russians to take care of it, and they will. Trump rendered us irrelevant, not Obama.