Why? It’s PBS. I could go straight to Rossiya Segodnya or Fars if I wanted propaganda first-hand.
There is no freedom under national socialist regimes. Especially those allied with Iran, the biggest state sponsor of Islamic terrorism on the planet.
I’m sure that you have enough political smarts to know that which way PBS leans - which is in the direction of Obama/Hillary, EVERY TIME.
So you might be a bit surprised if you watch this show - that’s how I judge things at least.