Probably what they fear is because bitcoin/cryptocurrencies are decentralized, and they don't have the power to control it. Normally, the government would fear for something that is beneficial to the community, continually growing positively, and they can't control. I guess their strategy is to manipulate the people, who majority doesn't know that much about cryptocurrency, by saying that it's dangerous to them. It can be easy for them, unless someone would educate them.
I believe so.Bitcoin can really attract an individual's heart and mind not just of its being decentralized,but the high price itself wherein people are really looking forward to learn how to earn and use bitcoin.With this,the government might fear that people will no longer patronize their own currency and start to evade taxes since bitcoin is tax-free.But that is too far to be possible because most of the establishments today still prefer to accept fiat currency than paying with bitcoin,although some shops are accepting it already.