You can document this claim, of course.
In the entire Milwaukee metropolitan area, population around 1.5 million, I know of about 1,000 people who are NOT attending a licit Mass.
And of that 1,000, approximately half are under the age of 16--that is to say, they don't get a choice in the matter.
There were better reasons to leave the Church, if you consider the lure of materialism and NFL football "better."
Remember, the Church never accepted birth control and is still quite serious about marriage, sensationalized reports to the contrary notwithstanding.
Further, the Church's 'social issues' stands, while sometimes also taken to extremes by overzealous MA/Sociology nuns, was also not too popular--especially with those who (to this day) despise the concept of 'civil rights.'