[njharman]

Not the grocery store, the guy at some factory somewhere that peas into the soup that eventually makes it way to your shelf.

Point is there is a huge web of people everybody trusts to not be evil. They are trusted for no good reason (other than as stated most people aren't sociopaths). But some are. Protecting against them isn't worth the tiny risk of exposure.

Likewise fretting over being "defrauded" by anonymous (but reputed) persons whom you buy illicit goods from is not worth worrying about. Same with ebay, kickstarter etc.