I don't beleive in some theories presented here saying that governments are actualy contoling Bitcoin by buying large amount in th beginig with the aim to destroy Bitcoin. This is just another conspiracy theory. And Bitcoin is not that relevant to governments as some might think and they don't consider it as such big threath, they have biger issues. But it's true that recently governments are more interested in Bitcoin than before because they see their opportunity to have their peace of cake.
True, I find it amusing how great the imagination of people here in Bitcointalk. Anyway, it is not logical to a government to spend a huge amount of money to buy Bitcoin and then destroy its market by dumping this bought Bitcoin. That is just a waste of resources.
I agree with you. The government can not just spend budget money for fun. Therefore, I am sure that the government will not manipulate the price, but large holders of bitcoins