Hardly anyone in the US is paying taxes on their bitcoin gains.

This is good news. There will be no sympathy for a lone tax evador. When it happens with masses of people, it can become a movement. Even if you believe people should pay their taxes, the actual tax applied to cryptocurrency is insanely complicated and dangerous (especially capital gains realized in one year but put back into crypto the next, with losses the next year).

The wider public won't sympathize with tax evasion until there is an alternative system for collective financial governance working effectively, but you could have an 'accidental movement' due to so masses of people caught unawares by unfair and hard to understand systems of tax.