Subprime mortgage question?

So as far as I know subprime mortgages were given to people who were considered “risky.” These subprime mortgages also had variable interest rates. How did the people receiving these subprime loans not realize that these interest rates would go up making the mortgage payments too much for them to afford? Were the mortgage lenders just that good at persuading them that the interest rates would not go up? I just don’t see how so many people could bank on a mortgage that could potentially have an interest rate that would reach a level that would make the payment unaffordable.

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