Most right wingers support Israel for one of two reasons
1. They want all Jews to return to Israel to die in the apocalypse.
2. The view American Jews (who are mostly left leaning) as a hindrance to their political objectives and want them to move to Israel to make their lives easier.
The more anti-Israel a person is, the more I, as a Jew, trust them.
Ah yes, the omnipotent liberal, who claims to know exactly what their opponents beliefs are and why they believe them, which is always sinister in nature. Must be nice to live in a bubble where everything you don't agree with is evil/racist/sexist/ect. Simple, really. Such a lifestyle requires no critical thinking and no self reflection. You're always the righteous knight in shining armor and your opponents are the demons who must be purged.
It's too bad reality doesn't work that way.
Anyway, this is indeed a cowardly and cynical act by Obama; but fortunately a meaningless one. At the end of the day it's just a strongly worded letter of condemnation mostly by nations who routinely condemn Israel every single day. Israel is a free society who respect human life, and goes through great pains to limit innocent life when fighting terrorist. They are the most like us, and a lone shining beacon of hope in a region that has been in turmoil for 1500 years. Meanwhile, militant Palestinians have no qualms about strapping bombs to children and blowing them up in public areas. But hey, who cares about those things right?
And it's just more evidence of how completely useless the UN has become (always was?). It's stated purpose to limit international conflict has been an unmitigated disaster. In reality, all it does is give platforms and legitimacy to dictatorships, theocracies, and human-rights abusing nations. It also limits the U.S. in negotiating capacity. In essence we're funding an organization (over 20%) that limits our power abroad.
BTW, all things in life, from single-celled organisms to herds of highly evolved primates, will fight for self preservation.