Society, or at least certain members of it, will always need people they can look down on, and feel justified in abusing, denigrating, or even killing, because they're 'less than human'.
Should pedophiles who act out their impulses on other people, or participate in the market of Child Pornography be punished? You betcha.
But I think a number of people are very disappointed that these people, acting on their impulses or not, were not more easily recognizable in public...like, a different color, perhaps.
Here's a game: Trade any racial epithet for the word "pedophile" in some of the more hateful, threatening posts, and see how it reads.