Like others have said, are you going to villify any politician who's ever appeared on the BBC
He didn't just appear on a TV channel. He was paid £20,000 to appear on Press TV the state TV channel of Iran, a country that, among other things, won't allow a woman to get a passport without permission from her father or husband.
Press TV doesn't pay politicians like Corbyn for their insight and knowledge. They are just useful idiots who who are happy to spout at length about the evils of America and the West.
I don't think he is an advocate for marital rape, but, as with Boris, I think his actions and character are not those of a potential PM.