Earlier quoted context omitted.
Dumb question, as I literally know nothing about stock or savings: isn't it generally a bad idea to put 100% of your long term money in any one place?
Isn't it stupid to just to have one job, one car, be a citizen of one country, have one house and one family. I mean really - one must diversify. What would you do if you lost any one of those? No, it's not stupid to concentrate wealth. Problems only arise when you do it stupidly, like buying too big a house, being part of the wrong family, living in the wrong country or buying an unsafe car. Diversification does not…
Concentrating wealth in stock is a particularly dumb idea, because even public companies are relatively opaque. Enron looked like a pretty good deal to an outsider, right?
Using things like citizenship, cars, households and families is a straw man and not related to financial investment at all.