I was born in 1961.
Just go to this site:
ctva.biz/index.htm
and look up dramas prior to the 1970s, medical shows, cop shows and the like. They;re are detailed episode descriptions.
In cop shows, look up 60s episodes of Ironside, Hawaii-5-0, Dragnet ect.
The Untouchables (which I have on DVD) got in hot water for a several brutal scenes in the first season, including a body in a freezer on a meat hook, at the mass killing of a truckload of prostitutes.
And despite Norman Lear’s assertion that sitcoms avoided touchy subjects, Room 222, preceded All in the Family by over a year. Love American Style was doing birth control jokes. What about the Smothers brothers or Laugh-In? Even the Beverly Hillbillies was doing drug humor in the famous “Robin Hood” episode…
Actually that’s one of my favorite episodes.

My point is, yes the dam was broken in the 1970s, but many of the subjects that are mentioned were being used in entertainment shows prior to the 70s, but in a far more appropriate manner.
That’s the only point I was making, maybe I didn’t phrase it right.