As someone pointed out to me recently when I argued the same thing, crypto and blockchain does have a use case: funding organizations and people through anonymous means as to circumvent the scope of the law/avoid the eyes of state or corporate authorities. This includes funding politically persecuted groups or terrorist groups as well as buying drugs or other more or less recommendable things. After all it's mostly what it's been used for so far (if we ignore speculation and various scams).
I think it's hard to argue with this.