I think the Black Hole question is because of a "point particle" concept. I've never thought of an electron as a point particle myself so I thought I'd have a look on google. I found this. It looks interesting, but I'm not sure what I can trust on the internet these days. Garth, pervect, do you know if this article is truthful and reasonable? Is it common sense?
"The point electron used for convenience has additional problems called a "mystery" by Sellin. Concentration of the electron charge in a point would require an infinite amount of energy and an infinite force to balance the outward directed Coulomb Force. If the rest mass energy is infinite, then the equivalent mass (M) equal to energy (E) divided by the light velocity (c) squared must (by modern theory) also be infinite. But the rest mass of an electron has been measured, and it is not infinite...