I think one reason why governments weren't be able to accept bitcoin is because it can disrupt the flow of economy inside a country. Imagine having something that you can't control. What would happen? It could cause a drastic, which is good if thing goes smooth. But otherwise, it could cause chaos like the typhoon does to everything in its path. Like the typhoon, you can't control its strength, range, direction, speed etc. Similar to bitcoin, you can't control it's price, it go down or up to the extremes, which is, a significant factor to consider once it is in the economy of a country. And once it happens, bitcoin will forever be changed.
It simply because Bitcoin is decentralized and a reason why some country leaders aren't making its way to ruin their economic interest.
it has been discussed already before about its regulations and wanted that the government will take control over it but it was been declined since there is no support from the community.
Some didn't while some countries also are open to Bitcoin and allowed their people to make use of it. It can be somehow in the future that these countries who against Bitcoin will change their mind.