I never understand any problem or drawback with bitcoin. If anyone is using bitcoins for criminal purposes, then you cannot say that it is a drawback of bitcoin or cryptocurrencies. Bitcoin can give countries financial freedom provided they make them legal.
Usage by criminals is not Bitcoin's fault. And the media always try to paint Bitcoin as the preferred currency of the criminals, although facts prove otherwise. A recent study by Elliptic found that around 1% of the Bitcoin transactions are associated with illicit activity, such as drugs trade or money laundering. And this proportion has been steadily declining, ever since 2013.