You are vastly overgeneralizing. Have you ever digged into the heavily moderated subreddits? The front page is not particularly representative of the positive parts of anonymity that spenvo is talking about. I am a very active reddit user and respectfully, you have no clue what you are talking about.

In fact, I would go so far as to say that reddit as a whole is representative of the younger (<30) parts of American society, not just a particular demographic or political group. Reddit has > 50 million users and is a very heterogenuous community. It is not just some hangout exclusive to nerds any longer. So you will see every political opinion and every positive and negative personal characteristic. As usual, the front page will show the lowest common denominator. There is by definition no way this could be any different, which you can see even if you look at the comments under any national newspaper article.