Their countries , their laws. It really depends on your definition for not supported too . If we speak about banning then as far as I know I don't think there is a country that actually banned bitcoin , at least nothing official and If there is then Its related to the banking system with one way or another . If its about the lack of usability in ATMs , local shops then there are plenty of countries and It takes time as some countries have more priorities .
True, because it is their defense mechanism to stop something of unknown origin that may affect their society, culture and economy. Some countries think bitcoin as a threat and its anonymity is something common to question specially by the leaders of a respective nation. Though I think it would only a matter of time before it is become legalized and accepted worldwide I think what we are witnessing now is maybe like an observation period for bitcoin and other cryptocurrencies.