Bitcoin as we know it, and as it was devised by Satoshi will ALWAYS be against the interests of the modern, blood sucking state, period. They will never be allies unless Bitcoin becomes Paypal and tax accountability is in place. This is just a fact. Why do you think Satoshi was so particular about his anonymity? Because he thought he could "mainstream" Bitcoin?
The state is not a monolithic entity. The FBI don't gives a hoot about bitcoin destroying dollars, just as long as they're getting paid(does it matters what?) and you're not committing frauds. The CIA loves an anonymous way of funding their spy operations. Taxation works the same way. They could tax people without violating their financial privacy, but they don't wanna.
The government could see bitcoin as a threat or an opportunity or just not care about it. It depends on how they see it.
It's like a doctor seeing a new cure for cancer that will end his job. He can see it as a threat to his livelihood or he could embrace as saving his life.