Bitcoin is not supported in several countries because the governments, firstly forms a currency. They like to control the currency. They control it through the central bank and this is impossible with Bitcoin.
The government through the media puts the panic across to investors, for instance, the Russian central bank previously “said such currencies were used in illegal operations, such as money laundering, and promised to crack down on the instrument.” referring to Bitcoin.
Some other media also reports "Bitcoin is not a legal tender of any country. Any transaction through bitcoin or any other cryptocurrency is a punishable offense," 
Another is "claiming that virtual currencies are often linked to money laundering and other illegal activities"