By that same logic, if your Bitcoin node relayed a fraudulent transaction it received it would be a vehicle for fraud, therefore it's safe to assume every Bitcoin user running a node is just as guilty as theymos as undoubtedly every Bitcoin node has relayed a fraudulent transaction.
We're not discussing logic or how things should be, had we our way. We're talking about US laws. US laws do not allow US person to run websites where people sell CI drugs, or promoting unregistered securities. This is basic stuff.
If Craigslist operators knew the ad was placed by a murderer, were informed, on multiple occasions, that the guy was killing people, and refused to take down the ad? You can be absolutely certain they'd be jailed.
Further, if most of the ads on Craigslist were made by killers, putting a disclaimer along the lines of...
or, rather, "We do not remove ads by likely killers. Thus far, it appears that roughly 95% of these ads have proven to have been placed by confirmed murderers. Use your head." just wouldn't cut the mustard
Such policy is simply illegal in US. As I already have pointed out, "If Craigslist operators knew the ad was placed by a murderer, were informed, on multiple occasions, that the guy was killing people, and refused to take down the ad? You can be absolutely certain they'd be jailed." That's what is being discussed - users alerting Theymos of a crime taking place, and Theymos refusing to act because policy.
There have been a number of court cases involving ponzis on the forum and theymos (or the forum) were not held liable