Why are u think that they afraid?
Maybe they all have mining farms in their gardens...
This possibility is likely
But Mr Bitcoin
BTC frightens
corrupt politicians and corrupt businessmen because
BTC will redistribute the wealth of the world again
That is the right answer there on the question "who is afraid". Fiat money centralisation and poor allocation had to come to an end somewhere, otherwise we would have 2% of wealthy in the future and 98% of people with nothing to eat. I am exaggerating a little bit because that could never happen because when any systems reaches a critical mass a change is going to happen. In these case the humanity would become unsustainable a long before it would come to that point, but mathematically it is really where the world is heading.....
I would add to your statement - private bankers because they are the ones regulating that "own" almost all FIAT money in the world. So it would be a "corrupt politicans", "corrupt entrepreneurs" and "corrupt bankers". Not all of them are corrupt though, I always like to point it out, just for the sake of not creating hatred, we have plenty of that already.
There is however the problem that Bitcoin is already centralised with whales holding the majority of the coins.... so Bitcoin is kind of beating it's purpose. Also, "greedy entrepreneurs" are already joining in heading of course to be more close to that minority having the majority of the coins then other side. Since I don't believe that it is really possible to decentralise Bitcoin I really do believe that either some altcoin, or more likely - altcoin taking into concept some other ideas and movements - like equal money and similar will gonna do it.