Economical/financial collapse, and natural disasters are all the things that I have found to create new preppers. The National debt is a great one were you show them the numbers on the internet National debt clock, number don’t lie. So is natural disasters they see them on the news.
What they do not understand and it is a turnoff to them is that if there is a economical/financial collapse there is going to be civil unrest and that civil unrest can get out of hand but do not talk to them about that because they will think you are nuts. So just talk to them about Economical/financial collapse, and natural disasters.