Governments, however, are likely not doing this because they stand to gain from cryptocurrency.
Governments sure are interested in the technology behind crypto (blockchain tech) but some of them are NOT REALLY INTERESTED INTO BITCOIN AND CRYPTO probably because of decentralization. Nevertheless, I don't see them wasting tax payer's money to do something as stupid as price manipulation. If they are really manipulating bitcoin price behind the scenes, there are only a few countries that I can think of doing this.