The State does not exactly "control" the Bitcoin, as in the network, in this scenario.
They just want full surveillance, which is more or less true for the fiat world as well - any bigger fiat transfer you make may trigger a manual check and require you to say whom are you sending to, why, and where did you get it from. I fully expect the State would want similar controls for Bitcoin.
They don't control the coin, but they can point the gun at those who control keys. Surveillance is how they learn where to point the gun. Can't have freedom without privacy.
Surrender unto Caeser that which is Caeser's. Bitcoin is not a product of states, it was created to spite them.