The main problem is that Sharia Law is extremely Right Wing but Ntanyahu's wing of Israel is also extremely right wing knucklehead conservative.
So, for the left wing, both societies are quite disgusting to actually side with. Nobody on the left is admitting it because they wrongly hold the idea that all cultures are equally good and valuable to the world.
What is clear is they loathe both sides, I do as well at this point and I notice the repressed 'cannot admit it' opinion my fellow leftwing thinkers hold. They just want neither side to get what it wants and did the whole time. They want(ed) Hamas to lose but to remain as a functioning terrorist organisation that may eventually free Palestine. They also want(ed) Israel to remain in peace but to not genocide 10s of millions of Gazans and make months of sheer terror and hell, making them worse terrorists.
Thus, there is a clear aim of the Left; achieve a surefire long term peaceful defeat for both sides ASAP. This has and always will be how to understand the Left's contradictory approach. Even I am supporting the approach now.