Jews Blocking N. Finkelstein's Tenure

There are Jews such as Alan Dershowitz who don't want dissenters of Israel to have a say in American politics. One of those detractors, Norman Finkelstein is in a battle of tenure because Dershowitz is influencing DePaul University into not allowing him tenure at all. Why do Jews hate Jews who disagree with Israel?

http://www.normanfinkelstein.com/

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Again, ad hominem is all Zionists can do to circumvent discussing the human rights violations of The State of Israel.