"Even if the property market crashes, you can always choose to default." There is always someone who loses here (investors who have put money in mortgage backed

"Even if the property market crashes, you can always choose to default." There is always someone who loses here (investors who have put money in mortgage backed securities?). Intentionally defaulting is not the most ethical thing one could do, and this kind of thinking has partly helped bring the recession upon us, which no-one could escape. No?