The process is simple:
1. print dollars until the amount of dollars in existence doubles itself.
2. watch how the price of everything eventually doubles.
3. notice that the price of all equities and commodities such as gold and bitcoin (the IRS considers it as a commodity) also doubles.
4. tax everybody's capital "gains" at around 25%.
and now the government has stolen 25% of your purchasing power.
that is why the IRS wants capital gains on bitcoin, up until now it was a way to escape the government's wealth transfer mechanism.
that is true.
Capital gain tax is partly what it is and partly a tax over the inflation they didn't get because you didn't hold fiat in the first place.