I don't think anyone on the left is seriously suggesting Shapiro being Jewish is a problem in the first place. Certainly they aren't in the places I've been seeing. Lots of commentary about how he's very much on the ideological unconditional support for Israel train, but as we saw with the Uncommitted movement, that's a criticism that is (legitimately!) levelled whether or not the person doing it is a Jew. I do suspect that the people making those criticisms would _not_ be brought into a rift-healing by the fact that he's called Netanyahu the worst leader in Israeli history - most of them have been calling the focus on Bibi a deflection from the Israeli state's _institutional_ anti-palestinian bias. I therefore think they'd regard that remark from him the same way: an attempt to suggest that replacing one man should resolve their objections and make what's happening in Gaza acceptable.