I'm pointing out that your clutching pearls here is a bit much.
It's a bit like grandpa shaking his fist at the sky "Back in my day....we didn't lie or steal....people never cheated on their spouses...people never cheated on their taxes...people never got divorced"
Extending your logic, you could argue that for most of human history, killing other people was frowned upon. But history would like to have a word with you.
Humans have a remarkable cognitive dissonance when it comes to their own failings (I'm speaking collectively here).
Let me ask you this - have you ever downloaded an "illegal" movie or TV show? Or "pirated" a book? Or "defrauded" the government, or not declared your full income?
Or looked at somebody's item, and thought "gee, I wish I had that gadget/book/car/house/holiday as well" (i.e. coveted)?
Arguably 75% of YouTube is people coveting other people's things - but you don't see the moral police clutching pearls and going - "How could they!!!! It's deeply frowned upon!!!! We must shut down this sin!!!!"
By your yardstick - looking at a woman (or man - we are in modern times, after all) with lustful thoughts, is already adultery in His eyes. And committing divorce also makes you guilty of adultery as well. Or marrying a divorced person. And also, doing anything icky before marriage. Yet are people going around saying "We must shut down this divorce nonsense! Divorce is not the norm! It is deeply frowned upon."