Why is no SilkRoad a good thing? You do realize that there's plenty more of darknet markets and when one gets taken down another just springs up to take its place? Besides, darknet markets are good for bitcoin as it gets money flowing in and out of bitcoin and coins moving around.
Silkroad was the posterboy for Bitcoin's perceived depravity. There are a ton of other markets out there and always will be but that's the one that people who want to hate it fixated on.
Depravity? It was no more depraved than your local boozeshop or Pharmacy. Lots of people saw it as a great libertarian experiment regardless of its ultimate fate. People should be allowed to buy or use whatever drugs they wish and some people see that as a fundamental human right and whether you like it or not and Silk Road and other darknet markets allowed that to happen for those people.