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.
Today’s average Western nation-state tends to be a rathole that spits into the faces of its citizens every single day, until the moment the state is under attack, at which point everyone is told that they owe their lives to their sacred motherland that has done so much for them.
Thinking you can defend a country just via volunteers is like thinking you can pay for a country just via charity, we vote to tax everyone for a reason. And people do that voluntarily afterwards, they are fine paying taxes as long as everyone is required to pay, same with defending the country.
That's a pretty binary view of the situation. It's not enough for something to be worth defending: People have to recognize that it's worth defending — and that might not happen instantaneously, because "people" come to appreciate things at very different rates.