True. But imo it is up to the country to decide if they think military service is a social duty, so, whatever. The idea that "taxes are all there is" is... Missing cultural relativism, I guess.
Ofc, caveat, if it's rich people deciding poor people have to do service, then yeah that's messed up. But kind of a separate issue.
It's not Brazil. It's just one year there (for those who want to serve, in practice), and you can't quit before the said year is over.