It promoted inhumanity. The laws here say you can die in war at age 18, but you aren't allowed to drink alcoholic beverages at age 18, which was the root statement of Americans against the war, making it inhumane to the citizens of Vietnam, who suffered the cons of the war. The Vietnamese found out the hard way, that the war was inhumane, involving a good reason which was an example of inhumanity.
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Hope this helped! Have a good day! (PLZ MARK BRAINLIEST)