You make no sense whatsoever. Your comparison makes no sense whatsoever. Holding a rental has absolutely NOTHING to do with holding a dividend stock. Two completely different things. You don't know what you're talking about.
So, tell me, how does the investor sell the home if it falls 50%? Do you realize that if your rental falls 50%, you CAN'T sell it because you have negative equity? Let say you bought a home for $500k and put down 20%, so you borrowed $400k. If the home falls 50%, that leaves the value at $250k. Now, if you sell the home, you will need to dish out $150k just to sell the home. WHY would you do that?
On the other hand, if you hold on to the home, your so-called principal loss in ON PAPER. It's not an ACTUAL loss. In the meantime, you keep collecting rent until the house price recovers, and have POSITIVE cash flow. NO CHANGE in income.
Again, higher interest does absolutely NOTHING to CURRENT owners. Higher interest doesn't change the mortgage payment of the current owners. Why would they need to sell the home? Explain that.