Well, it is not the problem with Bitcoin but the human involved. There are also cases whereby people buy and sell drugs or involve in any illegal activities using fiat.
This is true, and as users here of bitcoin, we should be responsible for the things that we are doing using bitcoin because if we are being reckless in using this, we must accept the consequences and we do not even know what will they be. To be sure and safe, it is better to avoid something that will ruin our lives in using bitcoin so that we may continue to receive the benefits of it.