I understand the rationale.
Israel is surrounded by people who wish to do it harm. History has taught the Jews that they cannot hope such hatred will come to nothing. Certainly, Arab governments do not do enough to control the terrorists in their midst and Israel rightly feels that something must be done. This has little to do with captured soldiers.
But the collective punishment of Lebanese civilians for the sins of Hezbollah goes too far. Realpolitik dictates that one famous Jew’s maxim about turning the other cheek is an impossible policy. Still, if you strike me on the cheek, should I pummel your face? As Mormons, we believe in the concept of just war, but the Book of Mormon teaches us that war must be proportionate. Israel has stepped widely over that line.
Israel wishes to defend herself, but the sight of Arab children killed by Israeli bombs may well put the Jewish state in greater danger. And when those bombs are paid for by American taxpayers, the US may also reap the whirlwind.