Taxes are money taken by force, in essence no different than a mugging.
Of course evil people use cryptocurrencies. Evil people use the internet and fiat monetary system as well.
None of this changes the fact that privacy is a human right, and that taxation is theft.
https://steemit.com/dmania/@funbobby51/people-in-colorado-be-like-zg1hbmlh-bqc6h