As for some of the factors that cause bitcoin is a dangerous :
1. Bitcoin is a digital currency, currency should be issued and maintained circulation by a clear, reliable and responsible institution. Here BITCOIN is not clear who is publishing and supervising.
2. The identity of the issuer of payment instruments, according to him BITCOIN issued by satoshi nakamoto. Satoshi nakamoto is not clear according to him.
3. Changes in the fantastic value of the exchange. They  mentioned that BITCOIN is not realible as a medium of exchange.
4. Broad acceptance of BITCOIN extension will undermine economic sovereignty,an example of the Chinese government's attitude that prohibits banks to accommodate transactions involving BITCOIN.
In certain sentences mentioned that BITCOIN is dangerous.