I personally know some of my friends, who have vowed that they will never ever use Bitcoin gain in their lives. Some of them lost quite lot of their coins (one of them lost more than BTC100) when Karpeles stole the Gox coins. And then there are two or three guys, whose wallets were stolen by hackers, using keyloggers and trojans.
Would they stop using cash if they were mugged in the street?
Would they stop using a car if they had an accident and broke a leg?