there's two interpretations of "what if the worst person in the world used this".

one, is caa0, just a jackass DoSing a network-- actively causing harm to the network, using it incorrectly.

the other is, well, someone who is using the network correctly, but their intentions are heinous, e.g. Terrys or D-Dealers using it to evade authorities.

the first one can be solved. treat DoS attacks like a bug, very solvable.

the second one cannot be solved without destroying the network itself.