Again, few people have more dislike of excessive taxes than I. Fewer still have more distrust of the government. However, the law regarding taxes is on the books, in black and white. His defense is not valid, has been proven to be so, and legal precedent clearly states that fact. Brown had his chance to go to court, he just couldn't present the defense he wanted, so instead of fighting the law within the law, he decided to just avoid the law, and provoke a confrontation.
Regardless of your opinion of the laws, this is still a nation based on the rule of law. You don't get to decide you "don't like a law" or decide a "law doesn't exist", and just ignore it. Things don't work that way. If it did, what we'd have is anarchy.
And trying to draw a comparison between the causes of the American Revolution and the Browns, or the Weavers, or the Branch Davidians, is insulting to the founders of the country, and to the intelligence of anyone who thinks rationally on the subject. There's a huge difference between King George and the elected government of this sovereign nation, and it is easy to distinguish that difference.