The more they try to stop bitcoin, the more it will succeed. Why? Because of the network effect it is built upon. The more people hear about it, the stronger it gets.
If the US tries to block bitcoin. Opponents such as Russia and China will do the opposite. Why? Because the US will shoot itself in the foot. They will automatically lock themselves out of a rapidly growing economy currently worth $1.5BN.
US Government, take note of a simple fact: Tax evasion existed before bitcoin, and it will continue to exist regardless of if you accept bitcoin.
To the people. The more the government takes note of bitcoin, the more you should. They are worried because at last, they cannot control YOUR hard earned money or dilute it. Let me remind you about how much the fed has devalued the US dollar since the financial crisis... trillions.