Also because those same mentally ill people are the exact same people with the time and desire to become internet moderators (no offense to dang or anyone else here, the moderation here is good!). Reddit needs to take control of subreddits back from moderators; too many subreddits are curated echo chambers, moderators are always trying to make money through bullshit like referral links, there's no transparency, etc.
Keep in mind that reddit skews younger than here, and probably considerably less educated as well. It's just too big to have the kinds of discussion you can have here