True, but this could be said about every truly anonymous internet service. There's for example a huge amount of incredibly scary and wrong stuff available on the TOR network. Child pornography, black market with every possible commodity, contract killing, you wouldn't believe (I did not when I first saw it).
But there are people's lives depending on this service somewhere in the world and that's why it must not be shut down. We may even need more services like it in case other parts of the world go to hell too...
With this kind of services or protocols we can either have no anonymity at all or we just have to accept the fact that this is what we pay for real and absolute anonymity. (And hope that the dangerous freaks will be hunted down and locked down in real world.)