"Virtually all shows before 1970 could be described as wholesome, with nothing more than slight suggestive lines in such programs as Batman, as mentioned elsewhere here."

That's not always true. For example the Twilight Zone (1959) is full of foul language its characters often take the LORD's name in vain. It is also full of immoral lines, such as: one time an old man tells a kid to "go play with a switchblade," another time a character talks about "slitting wrists," and many other times the characters talk frankly about fornicating and/or committing adultery and/or are depicted actually doing so on-screen (granted, it doesn't actually show them doing the final part of those things, but the images strongly suggest that they are about to...and the blunt dialogue outright blatantly admits it). It's definitely nowhere close to being wholesome.

But maybe the Twilight Zone was the first trashy show, and an anomaly for its time? I'm not sure about that, but I do know that even if it's the only show to do so, it definitely makes its era of TV impure and untrustworthy.

I was actually shocked to discover those things in the Twilight Zone, since LITB directly references it in one episode, and that's how LITB referred me to it. Because of the referral and the time when it was made, I was expecting it to be wholesome like LITB, but it quickly took a huge steamin' dump all over that reasonable expectation.

I do agree though that in general, TV became a lot more trashy after the 60's.