Yes, unfortunately, bitcoin has not only advantages, but also drawbacks. First and foremost, the most dangerous is anonymity, just because of this can not be tracked from whom and to whom money left, it also uses for corruption purposes.
You are right, corruption is very common in this regard, it became easier to receive and give bribes, since this can not be tracked. In addition, because of the anonymity of crypto currency, there is a sale of drugs and similar forbidden things!