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!!!"
That's the problem I have unfortunately with most people who spout things like "Silk Road shouldn't be shut down, we're just exercising our freedoms". Well no, it was essentially mainly a place for selling drugs, I am quite aware other things were sold but its main purpose was to sell drugs. There are ways to implement an anonymous website like Silk Road without having drug sellers swamp all over it.
It's called moderation though, and a lot of people seem to hate that too.