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I've been on Reddit since 2008 myself and was an avid user of forums etc for years before that. When I started on Reddit there was already an element of things having changed, a move away from niche technology discussion towards lowest common denominator stuff and discussion by meme. In general this was fine as you could just move to smaller subreddits, and the bigger pages had fun cultures that permeated the others…
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Secondly, they also have large numbers of participants from a range of backgrounds with a range of motivations. The subreddits they are discussing tend to have 10s of 1000s of followers actively engaging in various levels of harassment, I doubt that's a single sock puppet.
Thirdly, do you have a source for anything you're claiming?
Finally, if what you're saying is true then someone is posting child pornography to Reddit. Regardless of his intentions we should be concerned about that.