It's both. From the legal point of view, it's good that drugs are removed from the market, and from a violence point of view, it's good that it's all on the darknet. By clamping down on a marketplace you're basically just attracting attention to it and more people will start using it for buying drugs, thus, there will be less violence as everything is moved online. Also, the police did their job in a much more efficient manner like this. So it's bad for the dealers involved, but ultimately good for society.
This bust was good because it reduced the amount of drugs being sold on dark net markets.
Dark net markets are good because they reduce the amount of drugs being sold on the street.
So which is it? Is it a good thing to take down the dark net markets or not?