Even if, in theory, you're right that one should leave Israel if it is more dangerous than, say, the United States — and I don't know whether you are — it isn't. The life expectancy in Israel is 80.69 years; in the United States, 77.97. That is, despite the missiles and bombs, one can expect to live longer in Israel than in the United States: it is, overall, less dangerous. In fact, the only countries with a life expectancy greater than Israel's are (least to most) Sweden, France, Iceland, Italy, Australia, Hong Kong, Switzerland, and, at 82.73 years, Japan.
Source: World Health Organization, 2012, as tabulated by Wikipedia.