Arguably, anti-Semitism from the far right would make for far more entertaining telly.
But perhaps an issue is that when they put some neo-nazi on the TV to espouse their views, our fellow hand-wringers argue that this is platforming and will help them espouse their ideology to a wider group of people. But this happens less when it's the lefties you're platforming. Maybe any platforming of holocaust deniers is best avoided.