Plenty of Israeli leaders throughout history have made some very inflammatory comments about Palestinians, but it seems people only remember the ones made about jews and Israel.
For some perspective:
"We must expel Arabs and take their places."
-- first Israeli Prime Minister David Ben Gurion, 1937
"There is no such thing as a Palestinian people... It is not as if we came and threw them out and took their country.
They didn't exist." (italics mine)
"How can we return the occupied territories? There is nobody to return them to."
-- PM Golda Meir, 1969
"[The Palestinians] are beasts walking on two legs."
-- PM Menachem Begin, 1982
"(The Palestinians) would be crushed like grasshoppers ... heads smashed against the boulders and walls."
-- PM Yitzhak Shamir, 1988
"I would have joined a terrorist organization."
-- Ehud Barak's response to Gideon Levy, a columnist for the Ha'aretz newspaper, when Barak was asked what he would have done if he had been born a Palestinian.
"The Palestinians are like crocodiles, the more you give them meat, they want more"....
-- Israeli PM Ehud Barak, 2000
"Israel may have the right to put others on trial, but certainly no one has the right to put the Jewish people and the State of Israel on trial."
-- PM Ariel Sharon, 2001
Just some of the racist attitudes and double-standards on display in Israel, not from radical Zionists or hard-right Jewish splinter groups but from the very leaders of Israel, from before Israel's existence to the recent past. Certainly, violent militants like Hezbollah need to be brought to account for their words and deeds, but when hateful words like these come from the leaders of Israel and are ignored it's little wonder people under their control get desperate and furious. I see nothing in the above quotes that sets their authors apart from any common anti-Semite or Hamas/Hezbollah militant (apart from the subject matter, obviously). In this case, hatred isn't a river flowing out of the Arab world. It runs in both directions and if Israel wishes to paint others as hateful and bigoted and dedicated to its destruction, it should check its reflection first.
Source.