ITA with the limited perspectives in some of the comments here. The people we are talking about appear to be older Boomers, born post-war. For many of their formative years, the economy was booming, and the ethos was you worked hard and kept your head down and put a little aside for emergencies and such, and you'd be taken care of with pension and/or SS. If you wanted to invest, you didn't have any choice but to work with a broker, who recommended and chose stocks for you. But commissions were very very large (I remember my mom paying something like $600 once), so really only the rich invested. The MC put their money in CDs and savings bonds. But interest rates were pretty high (compared to the last @15-20 years), so they could get by ok. And the whole idea of personal finance being an area with a thousand different authors was nonexistent; you could go to the library and find a few, but since there was so much reliance on pensions and SS, the idea of "personal" finance didn't even really exist.
For many of these folks, the 401(k) wasn't even an option for most of their lives. I am 15-20 years behind the folks in the article, and I didn't even have a 401(k) as an option until '94 (and I've never had a match). And the choices? Hah! The best were standard mutual funds with 1-2% fees (because until maybe the past decade almost no one was paying attention to all the "hidden" fees and the impact of expense ratios). The worst was the one company that required me to put all my money in company stock -- again, not exactly outside the norm; it wasn't until post-Enron that there was sufficient public pressure to do away with that.
What happened to these folks is that the world changed, and they didn't notice or adjust. Sure, some saved (my mom did), but that was largely viewed as an extra margin of safety. The generation behind them (me) grew up watching pensions disappear and constant politicking over SS cuts and realized we couldn't rely on anyone but ourselves; but these guys are the ones whose pensions were being cut or who were being laid off when they were already 50 and couldn't do much about it. At the same time, interest rates dropped dramatically and for over a decade -- great for people like me, who were young professionals when direct investing through mutual funds became more widespread and cheaper, but horribly damaging to people who were raised to believe in the "safety" of bonds and CDs. And SS benefits were constantly tinkered with, again over decades, through changing standard retirement date, taxing benefits in some cases, and messing with the inflation adjustment formula. The result is as the article shows: benefit levels have not come even close to keeping up with the "real" cost of living for retirees.
Were there things these guys could have done differently? Of course - hindsight is always 20/20, and it's easy to judge them by today's standards and conclude they were stupid and deserve to lie in the bed they made. All I can say is that these guys really don't sound too different from my grandparents and great-grandparents; my relatives were just lucky enough to live in an era where pensions and SS were enough to live in reasonable comfort and security, and having a few CDs and bonds on the side threw of a nice bonus of cash for the occasional extra.