because it is out control of central bank and not depeond on $ or gold or oil
Because if they allowed it, other banks may have been ignore or others if allowed bitcoin some people used this in bad things. But the main cause for me to what government ban bitcoin is to they get no interest from the people who earn bitcoin in other words they got no money .
include this also, and other government banned this bitcoin because of some report that those citizens of them had experience to some fraud and scam accusations involving bitcoin so they just awaring that not to happen again in their country.