An article published on Ynet today details information just released by government censors that a Kassam rocket was fired toward the green line from Jenin earlier this month. Of course the author quickly points out that the range of this Kassam is "only" three miles, versus the longer range of the Kassams fired from Gaza.
That last little fact makes you feel much safer, no?
There is no reason to assume that the Arabs in the west bank towns will not figure out how to increase the range of their rockets. Which means that those living within rocket range will be an increasingly "inclusive" group.