The US government wanting to tax bitcoin is a good thing. By doing so they're legitimizing bitcoin. I see no problems here as I'm not interested in bitcoin to make money tax free, but to change the world.
You mean to say at least by paying taxes we need to make bitcoins legitimate ? Need to agree.
Anything received as payment for goods or services, including bitcoin, is taxable. If you earn income in bitcoin in the exchange of services with another person, it would become subject to income tax. In some places, if you earn money by trading bitcoins the gains could be taxed based on market value at the end of each tax year. So, no wonder if we happen to pay tax for using bitcoins in future. This is obviously certain.