In almost every case, people losing their shirts was a result of:
1). No real financial education
2). Concentration of assets in a limited set of equities
3). Impatience
You are right about the first two (although you then argue against number 2), but the last is wrong. It is more than impatience. It is the inability to ride out bad times. To 'ride it out' you have to have enough money to make it to the end. Many, maybe even most, do not. Most Americans live essentially paycheck to paycheck. They simply can't afford to lose a large part of their investments and hope that in 10-20 years they will have made it back. Many of them were counting on living on that money.
If we could transition away from concentration of equity ownership among the wealthy/ultra-wealthy to a healthier model where those who are now less-wealthy begin acquiring a greater share of corporate equity, do you agree that would be a good or a bad thing? Especially if we could teach them how not to be cheated by scammer?
Yes, it would be ideal. I just don't think it is a realistic solution. Simply put you are asking the same people that after 20 years still don't understand what all the buttons on their remote do to become, and remain, educated about an extremely complex and ever changing system. For more than half of Americans tying their shoes is the most complex thing they do in their entire life. The idea that you are going to teach them how to be savvy investors is simply not realistic.
By the by, if you'd examine some of the most-recent scammers (like Madoff) you'd find that the rich can be scammed as well.
Yes, they can but when you have a 100 million dollars and get scammed out of 80 million of it you still have more than enough to live in luxury. When you have 10 thousand dollars and get scammed out of 8 thousand of it you are probably going to have to figure out what essentials you can live without. There is a very different situation between how important money is between the rich and middle class. For the rich is it a power status, for the middle class it is survival.
If you really want people to have a stake in the future, then you must accept that some of them will screw it up royally. Babysitting adults in perpetuity requires taking away their ability to effectively own/control anything.
There is a difference between some people getting unlucky, or making seriously bad decisions on occasion and a system designed to fleece them. The system is designed the way it is to keep the status quo. This knife has a sharp handle.