Allan Kardec. The book of spirits (№ 397687)

Question: Why the suffering classes in society are more numerous than happy?
Answer: actually none of them is quite happy and what you think is happiness, often fraught with intense pain. Suffering everywhere. Still, to answer your point, I will say that the classes that you call the suffering, the more numerous because your planet is a place of redemption. When people turn it into a place where there is good and live the good spirits, then there will be no more accidents and she'll be for man an earthly Paradise.