Taxation is theft. "But who will build the roads" argument is really old and dumb, people are not some stupid monkeys who can't figure out things if no one guides them, there's nothing that can not be done privately and through voluntary cooperation (which is the same as privately). Roads, military, science and so on - all of it can and is done privately around the world. Government is exactly why Bitcoin was invented - you can't trust people with power and believe that they will do as they've promised, and even well-meaning leaders do stupid mistakes that cost billions. Just like Bitcoin have decentralized economy, some day people will decentralize power to the point when every individual will be independent from others.
Do you really think people are going to step up when they see the roads needing repair or anything else, especially when they see others not stepping up, thus leaving all the work to themselves until they say, "The hell with this."
The majority of people are not going to do things out of the kindness of their heart, and if they do they're going to stop as soon as they see them do all the work, because most people would rather slack off as much as they can get away with.