Social stigmatization is powerful tool, and only became less effective when the internet allowed scumbags from all over the world to meet virtually, instead of being rightfully isolated.
Dialogue does not work on these scumbags, because they don't care about debate or the truth. All they want is a platform to spread their views and to spout one liners to "OWN and DESTROY" their opponents. They will lie and lie again to reinforce their supporters' prejudices.
We need to make racists and fascists afraid of showing their faces again.
Don't cancel people for being jerks or saying a few stupid things sometime in the past. Those people mentioned in the article are far far beyond that forgivable level.