Phemie, my experience (and age) is the same as yours; two of the priests in my childhood parish (in Massachusetts, unfortunately a hotbed of wayward priests, it seems) have been removed from ministry.
One reason I have heard (and just one) for the abuse perpetrated by those in seminary in the 40s and 50s is the rightfully abandoned practice of entering a “minor” seminary in about the ninth grade. These boys should have been enjoying typical adolescent pursuits, socializing in groups with boys and girls, but were instead isolated and held apart, discouraged from relationships of any sort with girls. In some cases, as I understand it, this resulted in a stunting of “psychosexual” development, which could lead to the aforementioned abuse. (I’m by no means a psychologist; it was a priest who has done much to educate people about possible causes of the abuse from whom I heard this.) Anyway, that’s one theory; when the minor seminaries were done away with, at least that possible cause disappeared.