This is just a pure black propaganda. Bitcoin is very useful and it was proved many times that is has its convenience more than fiat. Those who damage the economy are those people who make under the table deals and officials like customs that ask too much money just to import goods. If only they start using btc then that damage would not happen again.
Some people don't like it when there are alternative means of paying for goods and services that either can't be tracked or properly regulated. Bitcoin is the way that people skirt around the standard currencies, and governments are the ones who don't like it. Mostly because they can't guarantee that they're getting their fair share of taxes from it. When you really want to get down to it, those who are already corrupt don't want competition leaking into their market share. As you mention, under-the-table deals and excessive import fees, which could take the form of bribes in some unscrupulous countries, are some of the biggest detractors from economic activity that can be measured, let alone considering the criminal aspects of it. BTC allows for more transparency, especially with the public ledger, but that's probably also why some people are against it. Some prefer their activities being left in the dark.
Country like mine who is filled with so much corrupt practices is the type that may never support bitcoin because of the transparency it will bring to its operation.
The corruption happening in the government of some countries is more than 100x of the one going on w the ICO, they are just using ICO scam has an excuse to kill the system, meanwhile they are simply protecting their own personal interest that BTC is capable to overriding.
Some government lives solely on citizens tax and has no other means of income, so how do we expect them to accept or even regulate cryptocurrency. It will really be impossible for some countries.