Bret Stephens:

Many explanations have been given to account for the almost matchless barbarism into which Palestinian society has descended in recent years. One is the effect of Israeli occupation and all that has, in recent years, gone with it: the checkpoints, the closures, the petty harassments, the targeted assassinations of terrorist leaders. I witnessed much of this personally when I lived in Israel, and there can be no discounting the embittering effect that a weeks-long, 18-hour daily military curfew has on the ordinary Palestinians living under it.

Yet the checkpoints and curfews are not gratuitous acts of unkindness by Israel, nor are they artifacts of occupation. On the contrary, in the years when Israel was in full control of the territories there were no checkpoints or curfews, and Palestinians could move freely (and find employment) throughout the country. It was only with the start of the peace process in 1993 and the creation of autonomous Palestinian areas under the control of the late Yasser Arafat that terrorism became a commonplace fact of Israeli life. And it was only then that the checkpoints went up and the clampdowns began in earnest.

In other words, while Palestinian actions go far to explain Israeli behavior, the reverse doesn't hold.