Why are so many Left Wingers anti-Israel/Pro-Palestinian?
Because that is the left wing ideology, they know that Jews are the least likely to give up religion and so compete with the state for the control of childrens minds. Just look at the Bolsheviks who had ex Jews in their numbers, and how they dealt with the situation. Then Hitler who was a communist and formed the National Socialist Workers party of Germany. They base their ideology and dogma on the Islamic codes as seen in the Pact of Umar and the Dhimmi laws.
They are cut from the same cloth as the muslims