After the terrible terroristic act in Paris where more than 120 people allegedly killed by IsIs, ghost security linked a Bitcoin wallet to the attackers in Paris. They said they had access to funds of 3 million eur. Other wallets linked to Isis are funded with not less than 23 million monthly.
So is this that point government needs to fight Bitcoin. ? I am Not an expert but with so many freedom related things the war and terrorism was a nail in the coffin. https://www.cryptocoinsnews.com/ghostsec-isis-bitcoin-wallet-worth-3-million/
Edit : link added
They won't kill or take over BTC. Just fight enough to audit, tax & regulate it :P