In as much as bitcoin supports victimless freedom of expression and victimless freedom of lifestyle, I support bitcoin's enabling of those.
While I am uneasy that it may enable psychopaths to get guns, and drug money may ultimately support violent cartels, I regard this as an artefact of prohibition, that is not really bitcoin's problem. However, if it allows a level playing field such that average citizens may defend themselves against psychopaths who will make all efforts to obtain guns whatever, or enables ethical sources of drugs to compete on a level playing field with cartels, then it's pushing things the right way.
Anyway, drugs are not THE point, they just happen to be a "headline" hot button topic that can be seen as an extreme of the freedom of lifestyle/expression continuum. Maybe innovation flows first to where it is most needed/wanted, so that use case was a disproportionate early adopter.