I extend trust to closed social circles. Not to the extent I get burned but my co-workers (squad) is tightly knit as well as my Brother Freemasons. I would even suggest we wager whenever we trust anyone, like when I moved into a better house in a better neighborhood I felt I should extend my trust to gain trust (still have not exchanged keys with my Nextie). If people were a little more familiar with classical logic they wouldn't even read drivel like "Truth About BTC" they would wager their own money based on evidence.