they can afford the rent, so they would also He able to afford the mortgage for it if given the chance.
Have you purchased a house? Because this part is simply not true. You have to have a percentage of the cost up front. The more you have, the smaller the payments. Lots of folks who are renting out places put a lot down so the mortgage payments (and what they charge for rent) are much smaller than a first-time buyer can afford. Then you have the cost of property tax, maintenance, and repairs that the renter isn’t liable for.