Because Netahyahu says horrible things likes this which are hard to refute:
"Throughout history the slanders against the Jewish people always preceded the physical assaults and were used to justify these assaults."
Obama's reaction to Bibi's refusal to make Jerusalem other than what it is?
Leaks of an admin policy of softening sanctions on Iran
Is anyone ELSE wondering what Israel's ultimate reaction might be to using their existence as a negotiating coin in some perceptually larger game?