I remember talking about this with friends when we first saw this thread going viral, and it brought a lot of things to light. What resonated with me was the portion in which he states that many men grow up believing they will have relationships/marriages like the ones of their household, but don't stop to think whether or not the women were happy in that household. For a lot of them, they really did have to endure a lot of BS (including abuse, infidelity, and the husband having a completely different family as a result of said infidelity). And for some guys, this is a tough pill for them to swallow; the fact that their grandparents' marriages might not even be happy despite being together for 30+ years. They don't consider the stigma of divorce, the lack of security the grandmother would have if they did divorce, etc.
Thanks for coming through with this story and the stats!