As Husar covers:
1. Should there be any standards in international relations? Some standards is demonstrably better than no standards.
2. Are some military technologies set apart from others? It seems pretty clear to me (as well as to a large proportion of the world's politicians over the 20th century) that chemical weapons, for one, are more weapons of terror than weapons of war, and so more like mines designed to maim than a simple shard of metal to the neck.
A key phrase in international laws is "
superfluous injury or unnecessary suffering".
Thermobaric weapons are probably illegal by the
spirit of international law. Is your complaint then that they are not fully illegal, that the law hasn't caught up to them yet? Hardly a case against restricting chemical weapons.
For further reference, here are the various
conventions and protocols on Methods and Means of War, and the
titled rules specifying their areas:
Chemical weapons used in assassinations have been ignored? Those were major international incidents that led to sanctions or other diplomatic retaliation. These didn't go unnoticed.
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