People who use these dark market shit deserved to get ripped off.
STOP BREAKING THE LAW ASSHOLES.
I sympathize with your sentiments. However, not everyone in the world has justice under the law. In some places it is perfectly moral to break the law because the laws are immoral, IMO.
But I suspect most darknet users are not in this category. They are trying to avoid taxes or the like. When their money goes missing they cry for help. "My partners in crime stole my money!! Help me government, I'm a victim!!!"