A PBS watcher and I might have disagreements about how much liberalism a show can have before we notice it.
I despised All in the Family, many of our less conservative members loved it and thought it was actually right-wing, in other words having a positive effect on society rather than what I saw as a negative effect.
The shows that I DO now and have watched on PBS, are NOT lefty ones at all! Are plays by Shakespeare Lefty? Hows about series taken from books written by Agatha Christie, Margery Allingham, Josephine Tey, Robert Graves, and Winston Churchill?
You have less than NO idea what I have read and/or watched on T.V.; yet have decided to tar with your rather puerile and pathetic very broad brush of assumption!