I'm not a fan of de-platforming, but there's pretty decent evidence that it can be effective [1]. I'm aware of no empirical data supporting the notion that it is counter-productive. That being said, it's certainly a theoretical possibility. It could be the case that exposing ideas to the light of day robs them of their power. But then, why are conspiracy theories so persistent? Why was Alex Jones so successful, in spite of the unbelivably simplistic and falsifiable lies he was telling?
I see almost zero evidence that sunlight acts as a disinfectant for ideas that appeal to people's preconceptions, and a lot of evidence that the modern left's tactics of shaming and de-platforming are actually the most effective ways to change culture and minds. To be clear, I don't like those tactics. I think that, in the very long run, they are probably harmful. But it is hard to seriously deny their efficacy.
> Also, with regards to Trump, I largely see his election as happening despite his association with the alt right rather than because of it. It's a big liability not just for him, but the Republican party. Trump's biggest advantage wasn't anything to do with him, but the fact that Democrats had alienated manyc centrists in the leadup to the election, and fielded a candidate that lacked the enthusiasm to rally their base.
I think that's part of it. Another part of it is that Trump saw through the stalemate stable equilibrium of left/right politics in the US. He correctly surmised that there was a middle path, that activated ethnic and nationalistic identities of the right, while simultaneously stoking economic anxiety traditionally associated with the left, to form a coalition that had unanticipated electoral power.
1. https://motherboard.vice.com/en_us/article/bjbp9d/do-social-...