If it's voluntary it's not a tax it's a subscription service.
But we don't trust you to act responsibly so we have to coerce you.
Like I don't know where you live but my taxes pay for people's health care.
Given the choice to opt out of it many would, only to find later they're are seriously ill and then go all Breaking Bad.
Similar with defense, agressors target populations wholesale, not individuals. When North Korea attacks the USA, do we go to Kim Jong Whatever and ask him to please only attack nostr:nprofile1qqsza748zkamgmw4he4hm2xhwqpxd5gkwju38wqh3twmtshx8kv8xvgpr9mhxue69uhhqatjv9mxjerp9ehx7um5wghxcctwvsq32amnwvaz7tmhda6zumn0wd68ytnsv9e8g7gprpmhxue69uhhyetvv9ujumn0wdnxcctjv5hxxmmdd79m6g because he didn't subscribe to the defense service?