If you have more than 120 or 130 I.Q. points, you can afford to give the rest away. You don't need extraordinary intelligence to succeed as an investor.
Anything can happen in stock markets and you ought to conduct your affairs so that if the most extraordinary events happen, that you're still around to play the next day.
You should be unconcerned about short-term price action when you own the securities directly, just as you were unconcerned when you owned them indirectly through BPL. I think about them as businesses, not "stocks", and if the business does all right over the long term, so will the stock.
I don't really think that, as a society, we [americans] want to confer blessings on generation after generation who contribute nothing to society, simply because somebody in the far distant past happened to amass a great sum of wealth.
The American economy is going to do fine. But it won't do fine every year and every week and every month. I mean, if you don't believe that, forget about buying stocks anyway... It's a positive-sum game, long term. And the only way an investor can get killed is by high fees or by trying to outsmart the market.