> 1. Mortgage rates are lower than rental prices in many places
When this is true, this actually is a very convincing argument. Not only that, but you can effectively arbitrage yourself into a lot of wealth this way. You buy a house and move into it for awhile, but then you buy a new house, move into the new house, and rent out the old house. (You get better mortgage terms that way.) Rinse and repeat whenever you can afford to do so and you eventually end up with a large portfolio of profitable properties.
Of course, it's arbitrage--if enough people do it, it stops working. You can keep it going with more money, if you can make larger down payments, since at that point you're turning a one time lump sum into an ongoing cash flow. But eventually you have to have more money to make money, so not even this might be workable.