So just require the fixed rate if you're using the downpayment program right? For many people what you call their "lifestyle" may very well be buying food, paying their mortgage or rent, paying for transportation so they can get to their job, putting clothes on their back, and not much else. It seems neither very reasonable of or rational to damn them to exposure to raising interest rates and no ability to build equity by forcing them to rent simply because they don't have money left over after paying for life to save for a down payment? Wouldn't your entire society be better off if they were all locked into low interest fixed rate loans, given that their monthly payments were no higher than their current rent and rent will only go up for them over the next X years?