Can a black market dealer in a corrupt society be moral?

I lived in a purely free society with a night watchman state, I think that being a vigilante would be unjust, as I would not be constrained by the due-process procedures that properly constrain the government. However, imagine that I lived in a developing country where the police and courts were corrupt, and they wouldn't do anything if I didn't bribe them. Then, if someone violated my rights, vigilante justice might be the only justice available to me. Likewise, if I lived in such a corrupt regime, I might only be able to survive and live decently by becoming an unlicensed operator in the black market. Yet then I'd be obliged to act as a vigilante too: if someone cheated me in the black market, I would only be able to exact justice by acting as a vigilante. Therefore, is the decision to become a black-market operator inevitably corrupting, even though vigilante justice would only be required because the police and the courts cannot be relied upon?