"If someone said that all Muslim should be removed from and barred from Mecca; if someone said that other people have more rights to Mecca than Muslims it would be wrong"
Yes absolutely. But no one is proposing, atleast in America, that jews be barred entry from Jerusalem.
"However if Saudi Monarchy was the only thing keeping Mecca away from people who claim those things, then all Muslims should absolutely back the Saudi Monarchy over those that wish to kill all Muslims in Mecca and make Mecca a Muslim-free zone"
Thats the thing however, they are definetly not. Because no one is. You seem to think the Israel Palestine situation is a life or death one and requires the unconditional loyalty of all Jews to Israel. Perhaps this is correct, even so, critique should still be able to be levied without being labelled a traitor. Aside from that, the Palestinians aren't some invading force, both Jews and Palestinians have controlled and lost control of the area known as Israel and Palestine throughout history. The Palestinians have as much a right to live there as the Israelis do.
And I highly doubt Jews would be banned from entering Jerusalem. It would be a majore international incident, and I can almost guarantee Germany and on their behalf the EU probably with tge US would step in through the form of extreme Sanctions and blockades. This would probably cause another oil crisis, but still things would be done, and Jews would be allowed to enter Jerusalem.
"The left may not directly want genocide of Jews, but they back people that openly do. PLO, hamas, hesbollah, Iran …"
Oh hell no