Because Bitcoin is not a major concern for them. Just a minor concern, a niche used by smart people as inflation shield.
I do not agree with you. If you look at all BTC related charts you'll see a growing users base, growing exchanges, growing value, growing market cap, etc... It is no more a gadget for smart and geek people. It is slowly getting mainstream. Governments could soon see it as a serious problem and make the use of BTC really hard by banning exchanges, BTC ATM, ....
As Jamie Dimon, CEO of the most active bank of the United States, JPMorgan, recently said : "the future of the cryptocurrencies will not last long since it is difficult for countries to regulate".