I think it is VERY dangerous to be a prep "evangelist".
The article didn't mention the single biggest danger to preppers (or anyone else who is not starving) is the starving masses themselves. If you have a cache, and anyone outside of your immediate family knows about it when TSHTF someone outside will find out about it. It doesn't matter that the masses aren't prepared. They will be numerous, motivated and probabaly armed and organized. If you are located within a 3-day march of a population center it may not be possible to defend your cache unless you maintain absolute secrecy-starting last year.
The first rule of prepping should be that you don't talk about prepping. With anyone. The only exception is if you are working with a like-minded network who you know well (and by sight) to organize beforehand.
Family members shouldn't be automatically "clued in", especially ones that don't live with you and especially children, who love to boast (when I was 10 I was told all about my friend's dad and his safe full of guns and ammo within an hour of meeting my friend). Trust no one until they are proven. Paranoia is a survival skill. Use it.
Churches, associations, clubs, etc. sound like a great place to organize efforts, but if TSHTF they will be OBVIOUS targets. In fact, once te store shelves are bare they will be the very first places the horde will turn to.
Don't buy supplies from people who know you. This sounds counterproductive and hard-assed, but when TSHTF someone is going to say to the wrong person, "I sold this guy down the road X amount of Y, I bet he still has it!"
Very good advice.