Hamas’ (and Iran’s) depravity - when our enemies know no limits: Should We? Do we need to act morally when dealing with an immoral enemy?

What does Hamas hope to accomplish with their psychological warfare?
Should we be swapping live Hamas terrorists for the bodies of captives?
Does international law or world opinion halachically govern how the IDF acts?
Do the Laws of War (e.g., avoid non-combatants) mean that you can never use a weapon of mass destruction?

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