In fact, people always forget that other currencies like the dollar are way more used for illegal activities. The Dollar is in everyday use for drug/weapon dealing and other illegal things. But people used to ignore this fact. A currency itself is there to be spent and the people can decide what they buy with it. If people abuse a currency for bad purposes, it's clear that the human being is the problem and not the currency itself. Beyond that the majority uses things normally and not for illegal purposes. Everybody has a kitchen knife at home, can it be used for bad things? Of course. But is a kitchen knife bad for the fact that you can hurt someone with it?