Your reasons are good, but in some countries these taxes are going in pocket of corruptical politics, so it has two sides
That is right but consider what can bitcoin brings to the country if they put taxes by using bitcoin it helps the country and we can used bitcoin freely and we are not worried at all about bitcoin banning.
I believe that government will not be able to place taxes on cryptocurrency because there will be more people who are going to complain about how the government is milking people just to get funds.