There certainly are arguments against a draft at the individual level - Example being if the people being drafted do not believe in their own governments ability to lead.

A draft is by definition forced labor either way - because if enough people volunteered there would be no need for a draft in the first place.

But usually it doesn't matter either way. Either the people believe in their own government/territory and see it as worth defending, or alternatively they don't believe in it, but their government is authoritarian and will force you at risk of punishment or death into being drafted.

In both cases a draft is still forced labor for those who did not volunteer to participate.