I just found out that using a .50 cal machine gun against people is technically banned by the Geneva Convention, as the .50 is supposed to be used against Vehicles and Materiel only. Why is this? If you are a soldier shooting at another soldier, the objective is to kill them. Wouldn't you use the most potent weapons systems to accomplish this?
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I don't know about the .50 cal specifically, but most of the weapons are illegal as shit for a very good reason - e.g. it's very hard to target specific targets without collateral damage (clusters) or it causes extreme, uneccesary suffering (chemical weapons).