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I think there's a non-splippery-slope way to position the worldview (...)I wouldn't discount the "slippery-slope way", because a slippery slope is not a fallacy when the slope is, in fact, slippery (and demonstrably so).
> My main counter to these ideas is that, similar to (pure) free market proponents, it takes on a very idealistic view of rationality that doesn't match real behavior.
That cuts both ways, though. Some vocal proponents of the "there's bad speech" view weaponize the Paradox of Tolerance argument, way past the point it's rationally applicable, and use it to beat people into submission. It's a very big problem in well-known online communities (including Facebook, Reddit and HN). For now, the effects are mostly limited to being called an -ist or -obe if you don't agree with maximally extremist view on some issues, and every now and then someone loses a job due to a Twitter mob. But I wouldn't want to live in a country ruled by the same principles.
Note that the side effect of extreme policing of wrongthing isn't just that the bad people get underground instead of being "disinfected by light". It's also extremely polarizing, because those on the fence now have to pick a side or get accused of being inssuficiently rightthinking - and some of those will adopt the wrongthink, at the very least because the wrongthinkers are nice to them. The historical equivalent of that is running your country by calling everyone not conspicuously patriotic enough a traitor and executing them; at some point you'll find that a chunk of your population actually defects to the enemy just to save their lives.
The way I see it, I'm all for maximizing accuracy and precision of beliefs and opinions, which correlates with rooting out disinformation. As for wrongthink - I believe the Paradox of Tolerance is recursive. That is, if in the process of rooting out the intolerant you start causing collateral damage among the innocent, you become the intolerant that should be rooted out.