I agree that there is a possibility the study was imperfect.
From observation in life though, people in modern society have definitely become a bit too easy on divorces. The problem at root cause is often moral. Nowadays too many people approach a marriage with the attitude, "as long as you keep making me happy, I'll stay with you".
The better attitude is "I'm here in this relationship with a servant's heart - to love and serve YOU" - and both people equally should have this attitude.
The former attitude almost never works, and ends in divorce. The latter attitude isn't a magic bullet either - of course, it wouldn't work if one partner just completely and maliciously exploited that into abuse, etc - but it works well when combined with selecting an actual good partner to begin with.
Nothing is a guarantee of course, but if you take a starting point with 2 people of relatively good character and without any extreme baggage like a tendency toward violence or exploitation - if you start from that point, the best marriages are where both people wake up wondering "how can I love and serve others today?" - rather than "how can that other person please me today?" - not gendered, just equal.
The other mistake (I think) people make is putting their children first, and their spouse second. This is a modern construct that is mistaken. Ironically, if, by doing that, the marriage ends, guess what that does to the children? Ultimately IMO it is my spouse first, my children second (which still leaves plenty of room for them, it's not like they are being neglected, I just 'see' it that way in my heart) - thus saving the marriage, which is (although we love to deny this is true in modern times) what the children want and need anyway, and everyone wins.