I think this is one of the reason why some countries want to banned bitcoin because of the illegal transactions doing by bad people. They use bitcoin for their safety, bitcoin is a useful tool that can help society to improved and i feel so sad that some people use it for bad.
That could be true because they don't want to see bitcoin will be used for illegal transaction although they know that bitcoin can do for whatever reason. The used of bitcoin itself will depend on the people, and I am sure that each people will have different purposes in using bitcoin.
Bitcoin can be a good thing or the bad thing, and we should use bitcoin for a good thing only so we can get the benefits of bitcoin and we don't have to break the law. But if we know that bitcoin has been used for the illegal transaction by our friends, perhaps, we need to remind them not to use bitcoin for that thing because there is a risk behind of the illegal transaction in the future and they don't know what exactly will happen to them.