I don’t disagree that there are deep problems in our society and that many Catholics don’t live their faith. The statistics quoted in the OP don’t prove that nullity decrees are rampant or being abused, however. And all your percentages suggest is that there is something deeply wrong with American society. I agree…I live here, I can see it too.
But, didn’t you ever know an older couple who had a “shotgun” wedding because she was pregnant with their first child? That marriage was assumed valid because the couple never asked the Church to find otherwise. But, if couples like that had ever petitioned for nullity, they almost certainly would have received a decree because their wedding took place due to outside pressure from family, etc.
So, yes, I think there were (and are) plenty of marriages that one could make an argument for being invalid. But the Church, in Her wisdom and mercy, assumes them all valid unless/until someone petitions.
edited to add…DIVORCE hurts children. Decrees of nullity DO NOT. I just wanted to make that important distinction. I believe you were talking about divorce above?