Earlier quoted context omitted.
So, if an individual buys BitCoin with some capital to not pay taxes for said amount of capital ,is he evading or avoiding?
IANAL but example taxable transactions might be to sell bitcoins for a gain, or to use appreciated bitcoins in a barter transaction. Losses are also taxable transactions, but in a good way. Mining is awkward, since I believe mined coins are taxed as income on the day they are mined, even if you don't transact. Best to talk to an accountant, of course, and not rely on the advice of a random HN commenter like me.
The IRS has indicated that bitcoins are property and taxed as such, so that seems unlikely. Do you have a source for this?