This analogy is not really exact. One can argue that paper companies are not responsible for extremist views, since they do not have advertisement algorithms which elevate such pamphlets. Paper is a neutral platform in that sense. So are smartphones, more or less. They sell based on features, the wow factor, a desire for mingling in with the in-crowd etc.

Social media platform algorithms, whether by design or not, drive discussion into the most extreme polarising tones.

In pragmatic terms, there is a world of difference between smartphones and social media.