aog, Israel is entitled to use whatever force is necessary to stop the rockets. If the rockets keep coming, Israel is entitled to increase the force applied until they stop coming. The answer lies with the people of Gaza. I doubt whether you applied, or would have applied, your sympathetic argument when the US bombed Hiroshima or when we bombed German cities. These rockets are not aimed at military targets. They are aimed at civilians. At least, at present, the Israelis have the argument that their primary aim is to destroy rocket sites and the structure of command and assistance related to their use, and that civilian deaths are incidental to that. The supporters of Hamas who fire their rockets have no such excuse. If Israel were to adopt their policy, which it has no sign of doing, it would be justified in doing so stopped the assaults.
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Lest you think so, I am no blind supporter of Israel per se, on some cultural or religious basis. My view is that everything we did in relation to the area after World War I was a big mistake, and the Balfour Declaration was a declaration of intent which was ill-conceived. But what is, is,and we must live with that.