Roughly half of Americans have life insurance, industry estimates suggest. Fewer people own policies that will last beyond their current jobs. Is that a bad thing? Maybe so. The insurance industry, of course, would like to see more Americans buy life insurance. But many financial advisers also recommend life insurance for their clients, for a host of reasons. Many families don’t purchase as much life insurance as they need, industry experts say, simply because they don’t fully understand how it works. ...