It's a bit sad how there aren't many places on the internet left that strive for the balance between no moderation (for example - various anonymous imageboards) and an extremely biased one (especially towards political opinions, eg. on Reddit and Twitter). In addition to that there are problems with bots made to influence public discussion. In my opinion, that's the main reason why you shouldn't base your opinions on the general public on content you see on the internet - it's relatively easy to manipulate any opinion in a way that it seems supported by a large (and loud) majority.