No one should be shunned and shamed for their worldview.
As wrong as they may be, shunning and shaming are also wrong-headed (in my worldview).
Edit: I think it's fine to respectfully share your concerns about him though.
I'd say read some history on effective non-carceral and non-violent ways to deal with hateful people: shunning and shaming is the best option. It lets hateful people live their lives in a bubble if that's what they want. But also gives them a chance to address their abhorrent views, make amends, and become part of a large community again.
But you have to understand history to know that.
I did. Read the end of the sentence you quoted. It's a snapshot of his hateful views. There is, however, breadth and depth to his hate. Which is I directed you a few good keywords to search his own words in context to get a taste.
I'd say take my word for it and don't waste your time. But it's your time, bud.