“Capitalism is the astounding belief that the most wickedest of men will do the most wickedest of things for the greatest good of everyone.” John Maynard Keynes
You've invented a number of straw men there, but the point was fairly simple and not really arguable - the U.S. - Israel relationship isn't one of equals or approximate equals. One of them depends on the other for its continued safety and security and the other simply does NOT.
Obama and Kerry's obligation is also to serve the interests of the U.S.A - not Israel. If those goals conflict, they have a Constitutional duty to act in our interests, not those of Israel. So it's the Israelis' job to convince Obama that the Iranian negotiations aren't in OUR interest as well as that of Israel, not the other way around. And what a lot of very pro-Israeli commentators have repeatedly pointed out is that picking a public fight with the person you're asking for a favor isn't generally considered a winning strategy.