Reply #7: For one thing

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the distribution of the Arab population in Israel is not homogenous. I don't know what the number is exactly, but the proportion of Arabs in the population northern Israel is significantly greater than 20%.

In addition, the Arab towns were not as well prepared as the Jewish ones. In some cases, this was the government's fault, due to underfunding; in other cases, contractors didn't build the shelters required by law* and bribed the local municipal authorities' inspectors to cover it up - presumably believing that those towns would never be targeted by Hizbullah.

*Since 1996, every building being constructed must have a "protected space"