Except population growth has been trivial over this period compared to the rise in divorces.

The post WW2 baby boom lead to a boom in marriage-aged people in the 60s and 70s. You can see it on the second of the plots on the post you linked to- look how the total number of marriages is increasing between 60 and 72.

And my point isn't that the rate of divorce wasn't increasing, it was (though not as much as a plot of total divorces would have you believe, much better to plot the rates).

My point is that 1969 wasn't a special year in the data. There is no discontinuity on the plots you linked to, and no discontinuity in the data.

Hence that social pressure gets harder and harder to maintain, and divorce looks more and more acceptable to the new generations.

This whole paragraph feels largely unresponsive to what I said. My point was that divorce rates stabilized in the late 80s, but marriage rates continued to fall. You can tell whatever story you want, but we have to agree on what the data is doing.