It’s hard to read the headlines and not conclude that becoming a homeowner is a terrible idea.

This week, the National Association of Realtors announced that existing-home sales in July had fallen an astounding 25.5 percent from the previous year. Sure, there was a federal tax credit in place last summer. But with single-family home sales at their lowest level since 1995 and unemployment still stubbornly high, home prices may fall further.

In the meantime, millions of homeowners are still far underwater, and government programs to help them have fallen well short of their goals. More foreclosures are coming, casting a deeper shadow over home prices. So it’s hardly surprising that the conventional wisdom says that home values will never again rise faster than inflation.

But as with stocks and the weather, it is dangerous to assume any certainty in the housing market. And by wallowing too much in the misery of others, people looking for a new place to live run the risk of thinking every home purchase will end in regret, at least financially.

Many still could, if they buy in hard-hit areas where prices could fall further.

But a mortgage is still a form of long-term forced savings, after all. This is more important than ever, since fewer people have access to generous pensions than they did during the last big housing slump. A 401(k) or similar plan is no bargain, either, with its erratic returns and employer matches that come and go as the economic winds shift. Social Security is also likely to be less generous, and Medicare will probably cost more.