It is amazing to me how people will reason by fact-selection. This argument for a draft is based on the example of the Vietnam war, in which the draft helped mobilize vehement opposition. Yet the same example shows that this opposition did anything but end the war immediately.
It’s not like this is a seldom known fact. The Vietnam War dragged on and on, the National Guard shot American civilians, and so forth.
Life simply is not that easy. The draft is not a war-ending miracle.