I think it's primarily the capability to explain it that you lack. And yeah, the world's most advanced supercomputer can't steal your bitcoin, but you're still vulnerable to the old fashioned $5 wrench attack. Or being jailed until you make the payment or give up your keys. Or seizure of physical assets. Or denial of access to benefits or services. Or a dozen other things. It's true the government can't just seize your bitcoin, but they still have the power to make life extremely miserable until you do what they want. 

 Maybe it is my lack. What options do you have with physical money or gold? none, they can take it and kill you - with bitcoin you are dead and thats it. btw. how do you think the goverment is funding that if they don't have anything?