I don't have a strong opinion on the matter (nor do I support the draft in the sense of furthering imperial interests) but one effect of a draft is that it creates a class of anti-war, trained veterans both on the battlefield and at home. Which is pretty dangerous to institutional power structures if that demographic can't be kept satiated.

Wouldn't go as far to say the draft should be re-instituted in the US or that it's a good thing. just an interesting side effect of it sometimes