It's like when I say to you "hey, i'll protect you and your family and build you a house" and then you say "no, i don't want that" and then I say "well I did it so pay me." I mean sure you live a better life but you didn't consent to that.
Think about it.
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It's not theft. You might think it is but it's not, you do actually get something in return for your contribution. You know...... defense of the military, protection of the police, emergency services, education, health services, roads and the protection afforded to you by your citizenship etc etc. Yes it's compulsory, but it's also proportional. It's not theft.