no one really complained when it was aired. That's all revisionist history.
Did I *say* they got a lot of complaints? No. So, I am revising nothing.
In TV of the time, you have the campy old Batman TV show, the Spider Man cartoon, Lost in Space, Voyage to the Bottom of the Sea, Get Smart, the Andy Griffith Show, My Three Sons - all "family television". Nobody gets seriously hurt, you don't get much controversy around the content.
And you also have The Prisoner, Mission Impossible, Ironside, The Fugitive - not so much "family TV". I suggest Trek has more in common with the latter than the former. People don't just get shot and die on Trek, they get outright disintegrated on screen, there's monsters who put suckers on your face and suck your life out of you.
I'm suggesting that TOS was not guaranteed to rest comfortably alongside Batman and My Three Sons where you could sit your 8-year-old in front of it without worry about the content. It is tame by comparison to today's adult programming, but it wasn't particularly tame when it first aired.
A little different than a show about p*** addiction, with explicit depictions of said addiction.
The episode includes the addiction (reflecting both Barkley and LaForge's holodeck issues from 30-ish years ago), but it is really *about* marital difficulties between partners who have some major issues between them.
The term "explicit" has several meanings. There is nothing seen in that episode that gives broadcast sensors pause, or that can't be seen in a music video that parents probably haven't blocked on Youtube.