If bitcoin will be considered to be a legal tender I guess it is just and right to imposed tax on any income out of bitcoin but since at this moment it is not control or regulated by laws and government putting tax is not a fair thing besides whenever we use our income to buy things there is already VAT so for me no need for bitcoin to be taxed
Most governments tax any sort of income you have. Speaking about other, traditional investment instruments, the money you make off of them is taxed as well, so why not bitcoin? I do realize this is easier said then done due to the unique features of bitcoin, but it shouldn't be a surprise to anyone that governments want to tax bitcoin.