You say "earn money with Bitcoin"... fact is that Bitcoin is the money, so when you earn Bitcoins, you are actually earning money! Money, as something valuable, something you can exchange for other valuable things!
"Bitcoin brings us true freedom of thought"... before that Bitcoin show us there are alternatives to the current economic centralized systems! And that is what opens your mind... why to be a slave of your country and bank, and to do what they want you to do, to pay fees as they set up, why all that when you can be your own bank! When you can move your money in the way you want... yea, that's is freedom not only of thought, it's the economical freedom and independence as well!
Also having the fait currency means that you are the slave of the government or the banks. The paper money will cause a lot of inflation and your purchasing power will keep on reducing over the time. With Bitcoin since no one can produce more bitcoins, it have fixed supply the value of Bitcoin will keep on increasing over the time and there is zero inflation.
So keeping Bitcoin is more safe than keeping the paper currency.