How many businesses do you know of that pay no taxes at all? Even mafia fronts pay some taxes (having your front shut down for failing to pay property taxes tends to work out poorly). There is also the matter of where those businesses will get their supplies -- eventually they are going to have to deal with someone who pays taxes.
What this boils down to is this: how much faith you have in the government's ability to enforce the law, particularly those laws related to money. I have quite a bit of faith in the government's ability to enforce the tax code; even people who cheat on their taxes are rarely bold enough to not bother to pay any taxes.
They can enforce it within their powers. Confiscating bitcoins like they confiscate wages is not within their powers. They can jail you for evading taxes apparently. C'est la vie.
> Confiscating bitcoins like they confiscate wages is not within their powers.
The government confiscates wages by sending legally binding orders to people who they believe might owe you wages directing them to remit the owed wages to the remit them to the government instead.
They obviously can do the same thing with bitcoins. The only current difficulty with doing that with bitcoins now is that bitcoins are currently used for so few transactions for so few people that its not likely to be worth the governments effort to find out who is likely to owe you bitcoins to serve them with such orders. If bitcoin were to become widely used, that would change.
I suggest you reread the sentence that precedes the one you quoted (and which is the one that "the same thing" refers to.) Because it answers your question.
What matters to bitcoin users is whether the transaction goes through or not.