Tax is a form of slavery and theft. So my answer is no to any sort of tax including a capital gain tax. Hopefully one day we stand up and say no more. Bitcoin is a way to free money and freedom.
Tax isn't a theft, it's necessary for the cycle of money and economics in general, how else would money come back to the central government budget? I agree that in some countries, especially developing ones, governments do steal a lot of money and that's why things are turning ugly out there, because money that was derived from taxes should be spent on governmental and social needs, e.g. supplementary benefits, country reconstruction, subsidies and national improvements in whole. If there are no taxes the country not only will stop developing, but will begin to fade. Let's take Austria, for example, this country has one of the biggest taxes - 55%, but people live in affluence there, have lots of opportunities and high salaries, clean and smooth roads, comfortable conditions in short, so taxes aren't hindrance if used properly.