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Hamas has declared war on Israel, and Israel has declared war on Hamas.

Killing your enemy is never against "international law" even if there were such a thing. War is precisely what you have when normal law is insufficient to resolve a conflict. If "law" were relevant, it wouldn't be "war". War ends when a return to rule of law becomes possible, and that happens when those who are not satisfied with normal law have clearly won, or are clearly defeated, or are dead.

There is no law that both Hamas and the Israelis recognze that they are both willing to trust with their lives and futures. That leaves only war, and once you have arrived at war there is no alternative but to wage it and win it. Hamas has no interest in sharing this earth with Israel. Understanding that simple fact brings clarity. There is no second place here, it is all or extinction.