When the main purpose of it is not valued and people is using this to do illegal things. Bad things should be stopped. It may be a great help for everyone but once it became a threat, what's the use of holding and using of it? Once it harm the people and the country, it might be destroyed. Completely. The abuse of this may result to forever losing of bitcoin. Value the main purpose of this and never let this to be a mean of illegal things/transactions.