No. Intent and context matters. USPS/FedEx/UPS are businesses that primarily perform legal services, and follow US laws when its discovered that they were used for illicit purposes. On the other hand, Silk Road was built from the bottom up as a black market to service illegal goods. The idea that they just provided an anonymous marketplace and that unfortunately had illegal stuff happen on it is transparent lie that ignores the work Ross and his team put into promoting it as a drug marketplace.

Context and intent are important and laws aren't computer programs.