Take it from someone who has lived a lot of life, acquired plenty of experience in the process, and then attained two degrees after he was 40 years old; intelligence and degrees rarely equates to being wise. Age, maturity and experience will serve you better. Prep for him and continue the dialog and I bet he'll eventually come around. It honestly sounds like he hasn't had an awaking experience yet; that one thing he reads, sees or witnesses that turns the lights on. It takes awhile for some of us and when it happens you can always reserve the right to say "I told you so son, welcome to the group", with a smile of course. Greece does not have the ability to print their own money like the US so they cannot stave off their debt collectors. The US can print at will, so our harm will come from the devaluation of our currency followed by hyperinflation. He may be correct in thinking that the shelves will be stocked, but who cares if they are stocked with bread that costs $100 bucks a loaf. Whenever you as a father see something that is so convicting of your beliefs, as to why you are preparing, be sure to share those examples with him. If they really mean that much to father, then eventually the son will catch the fever.