I mean, nobody outside the US knows him so that's pretty normal, there's nothing to fix. His show was mostly broadcasted only in America and it wasn't an international phenomenon like Sesame Street. If it hadn't been for last year's documentary, I wouldn't have any idea who he was either.
I'm not disagreeing with you, but it's not hard to find out who he is and what he's about.
The documentary's trailer made me feel far more. You have actual Fred Rogers and there was no way that this new movie's trailer was going to beat the music that kicks in at the one-minute mark. I still want the track, even if it's from some trailer music outsourcer.