> Multiple teenagers (one in Australia) died from the drugs distributed on Silk Road
more or less than those who bought drugs from street dealers?
could it not be possible the silk road saved the lives of many more teenagers who would have died from street drugs otherwise?
I don't think those types of hypotheticals are taken very seriously in court rooms. One, they are effectively unfalsifiable, because it's a about harm that could have happened but didn't. Two, they can be applied universally. Any action might have prevented a catastrophe, after all. Courts persecute based on laws broken and harm done.
Ironically our justice system sometimes does persecute based on hypotheticals. For example persecution for driving recklessly, which is inconsistent with the principle above.