i think government could kill and stop bitcoin if they want and they can do it as fast as they can because they have unlimited source to do this. but i think the government will thinking to not stop or kill bitcoin and i think they are now is study about bitcoin, they have many questions about bitcoin and they need the answer. so they let us to still use bitcoin because they know that they can learn bitcoin from many ways and they want to see how bitcoin in future.
Agree that governmenr in all nation can stop bitcoin, they can make it if they want but instead of forcing to stop bitcoin they are now learning on how to male it better. I think all government now are seeing the good benefits brings to all people, like here in our country i know that our government are now take a step to make bitcoin legalized our central bank launch an statement that they will support decentralized currency.