https://www.deepdotweb.com/2016/01/23/bitcoin-playing-an-increased-role-in-crime-europol-says/Would you believe that the existence of bitcoin has increased the number of criminality in some countries in the world. This is the issue that was being thrown by the EuroPol and the UK Metropolitan Police. According to them bitcoin has played a huge role on the increasing criminality in their area. They added that a huge number of cybercriminals were using bitcoins in their activities.
This just shows that as bitcoin develops both advantages and disadvantages will tag along.
It is true that bitcoin can be used to some illegal activities that causes the criminality of a certain country to increase thats why some of the governments in some countries in the world already banned bitcoin in their place. Bitcoin can be used to buy illegal guns, drugs, hiring a hitman and many more illegal things in the internet. That is one of many disadvantages of bitcoin and the reason why some people are against it.