Loving by no means made it "predictable" that two men could marry.  There is nothing in the logic of that case that suggests that marriage means anything other than marriage, or that two men have the right to marry, or that the States MUST re-define marriage in order to grant a "right" which, until 40 years later, would have been thought absurd.  Your grand-children are shocked because their morality has become totally secularized, godless, and un-hitched from reason and Natural Law.   In them, you are seeing the consequence.