Paying tax from our earnings in bitcoin is a positive for me because even though there will be a less in our earnings, we can still have a good legalized currency in our country and that is bitcoin which in Japan they can use it to buy things in their country and paying tax is still a good side for me because we can help our country to improve itself by just paying tax.
As long as the tax rates are reasonable, I don't have an issue paying them. But look at nations such as Germany. They have income tax as high as 45%, and on top of that the indirect taxes are also high. The VAT for most of the common goods range from 20% to 50%.