Bitcoin is not supported in other countries because they protect their own currency. They afraid that their currency is down. The government is fear, they want to protect their own currency.
No that is not right that they restrict bitcoin because to protect their own currency but the actual reason is that they are of the opinion that with bitcoin some criminals will start their crimes and we will not be able to trace them with their financial activities.
Yes, it will be quite sad for me to hear that they banned bitcoin because of some fraud and illegal activities they should consider the good use of bitcoins.
Even if they legally restrict the use of bitcoin there's no guarantee that criminals will stop using it.