A favorite bit of a local comedian near me involves her making a facetious argument that blind people shouldn't be allowed to use guide dogs.
In her case, it's an intentionally absurd argument and the humor comes from not only the shocking claim but also the far-fetched idea that anybody would genuinely believe that.
However, one reality that we find ourselves facing with distressing regularity nowadays is that there's no idea we can think of that's too ridiculous and horrifically offensive for people to genuinely believe.
After all, people have proved time and time again that you don't actually need to understand a topic in any way to have an opinion about it. And one man experienced the most extreme version of this phenomenon at the most oddly coincidental time possible.