Get a load of this from HuffPo. This is the first link.
There's plenty more at the second link.
PS Although I am sure that Deir Yassin didn't motive Tuesday's terrorists, Deir Yassin was actually located at the entrance to Har Nof - probably half a mile away (when I first moved to Israel the former homes of the residents who fled - they weren't expelled - still stood).
More on Dir Yassin here.