I just now decided to peruse this thread in light of Ainamotore's recent ban, and I think he was on to something. Of course the voluntary taxation thing is silly, but the opt in/out aspect is very intriguing. As we all know, I think our experiment with democracy was a resounding failure. Politicians are all corrupt liars, and rarely do things that are in the interests of those who elect them. However, if the people actually had some direct control over their actions, via purse-strings, that might actually empower the people (yes, I know that I think the people are fucking stupid, I'll get to that).
Hypothetically, what would happen if we came up with a system where everybody still paid taxes, flat or progressive-whatever, but had the ability to opt in or out of categories? One option would be to send your check with no strings, an option plenty of people would choose. The other option is to direct your money. Set up a system where one has to select a minimum of programs, let's say five (out of hundreds) with a minimum contribution to the first five, like maybe 10%. Plenty of people would choose not to fund the kill-brown-people program. Others would give the maximum 60%. Personally, I'd prefer not to be funding abstinence only education, since I find it morally reprehensible. I'm sure others would prefer to opt out of stem cell research and other such Godless endeavors. Would we still be fighting two wars if defense was de-funded by 25% due to the wars being unpopular?
I don't know how this would work, and it's certainly simplistic, but it sure seems like there should be a way, and I don't see how it could be any less effective. If the people can't control the fucktards they elect to office, they should be able to control the money. What are the downsides?