Meaning of: "The trouble ain't that there is too many fools, but that the lightning ain't distributed right"
On its face, I take the underlying meaning of this quip to be "If lightning bolts struck people down according to their deserts, they would target more of the world's idiots".
(I suspect that most of us have some sympathy for this sentiment.)
If the lightning were correctly distributed it would keep fools down to a manageable number.