It's just unfortunate that everything that could be otherwise used for something completely legal can also be used for illegal purposes. Use cases of bitcoin that are both legal and ethical far outweigh any of the negatives it might had and that makes it a stunning technology.
It is the saddest part of bitcoin or let's say blockchain. As it comes with anonymity, it brings criminals behind. Not just now, even when bitcoin was new it was being used by the deep side.