Go back to 1968! Up until then the Hays Code which gave guidelines for proper movie scenes.
Then the murder of Bobby Kennedy which brought about a revulsion of violence on TV, comics, movies, pulp fiction covers.
Adult TV shows, still safe for kids, dumbed down to kiddie shows. magazines changed their covers , movies on TV were butchered beyond recognition to remove “violence”.
But the movie industry got a pass when they said they would “police themselves” with a joke of a ratings system.
“Hot dog! The Hays Code is dead! If you got it film it!” and scenes were reshot adding more blood, guts, violence and rank sex scents to many movies, to get the now coveted “R” or “X” ratings.
In order to get people used to this they also began to slowly add vile cursing in more mild shows.
A movie rated “R” in 1969 would now be rated PG or PG-13.
I saw a “G” rated western in 1969. I saw it again not long back on a cable channel. This one would have been rated a heavy “R” if released in 1969. Same actors same show but more nudity.
And ultimately 'The Rural Purge' in 71.