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Yes, but the government makes the rules... If they decided to suddenly outlaw trading and transacting in Bitcoin, it would suddenly lose most of it's value.

Oh they can try, but once it goes global, no one government can stop it.
http://www.reuters.com/article/us-russia-bitcoin-idUSBREA1806620140209

It's like Google, Facebook and Instagram , which are banned in here in China. People find a way to get thru. I need to use a vpn. Even For Steemit

But I do agree they can make it difficult. Here in China they prevented bitcoin exchanges to do RMB withdrawals
https://cointelegraph.com/news/china-bitcoin-exchanges-what-withdrawal-suspension-really-means-for-users

Or banks closing your account because of Bitcoin
https://community.coinbase.com/t/bank-account-close-because-was-using-coinbase-and-buying-bitcoins/12497

This one is not limited to US . The exchange I use in Singapore had to move thier bank account