I disagree tottally with the above assertion that "politicians believe that bitcoin will stop corruption".
As a matter of fact, bitcoin helps politicians to be more corrupt without anyone noticing.
So politicians like bitcoin.
They can launder money with bitcoin untraced.
No I dont think so because many people have putted their black money in bitcoin and that is the reason that many governments in the world have banned cryptocurrency in their respective countries. They want to stop investing illegal money. My country has also banned cryptocurrency few months ago, but I am sure they will allow its trading again.