I don’t see you having any blame. Supply and demand for housing includes everything, including rentals. You would be part of the problem if you bought those places and left them empty as vacation spots or something. You didn’t, you’re supplying them to people who I’m guessing wouldn’t be able to buy them themselves. You’re not driving up the cost of housing. I’d argue that, since you’re charging less than you could, you’re actually lowering it.