Fiat can't be oppressive, it's an inanimate object. Just like a gun doesn't draw people to violence, it's just a tool. Also, like others have mentioned, BTC wasn't made to eliminate fiat. It was made to give people a choice. To show them that the way of the government (go to school, get a job, take a loan, buy a house and a car, save for retirement, pay taxes, get social security) isn't the only way.