Restriction and prohibition is the main weapon of any government. Bitcoin can not circumvent that, in everything else the coin is still unregulated because it is a decentralized asset
The real question is why any government needs a weapon against its own citizens.
I think you have to open your eyes and think broadly about of your question because the answer that you were looking is in front of your eyes. A little common sense and it will sink everything into your brain.
The government can do/make any regulations regarding of the needs and security of their people. And if Bitcoin will become a threat to them due to its decentralized attribute they may follow the steps of other countries for banning Bitcoin and cryptocurrency.