I strongly think that government should legalise bitcoin, because it may become a great revenue source for the goverment by imposing taxes of more than 30% and it can develop our country in so many ways.
Though there may be reasons for government not legalising bitcoin, it's suggested to adapt or legalise it as the government economy would enhance which will support the growth of citizens and etc. We can see the development of the countries who accepted bitcoin. They even started creating their own crypto currencies on developing the projects supports the countries. The wealth standard would grow certainly when bitcoin is adapted.