Bernie Sanders is a very easy to find counter example. I don’t like the guy, but he definitely criticizes Israel. I’m sure I can find countless more counter examples to what you’re claiming.
“Sanders, speaking at the national conference of the Middle East advocacy group J Street in Washington, D.C., called on the U.S. to adopt a more balanced policy toward Israel-Palestine. He condemned recent Israeli attacks on nonviolent protesters, called for an alleviation of the humanitarian crisis in Gaza, and even threw in some harsh words for Arab autocrats who express concern for Palestinians but don’t put their money where their mouth is.”
Speaking at the annual J Street conference, Sen. Bernie Sanders once again condemned recent Israeli attacks on nonviolent protesters.
theintercept.com