This is a good point. The pseudonymous internet is like a confessional booth. I can bluntly say all my political beliefs here with little-to-no consequence that I can’t solve by registering a new account. There’s no risk of alienating a friend or family member who disagrees. As an extreme case, I’ve met a couple of people online who can be legally killed for their political views (e.g. not following the state religion). So the internet can provide more comfort in free expression and therefore more people arguing over differences.