taxation is theft. You don't think the government taking half your paycheck each year (income taxes, payroll taxes, sales taxes, gas tax, capitol gains tax, etc.) while debasing your currency is theft?
The question upthread should be understood as saying "given that it's acceptable for the government to tax people (an assumption almost universally shared), why should it be okay for a Bitcoin user to cheat the government (and by proxy their fellow citizens) out of taxes on $300M of Bitcoin?"
I think that's a reasonable question.