Because they believe that people overreact and its important to be reminded that it was never anything to be that upset over.
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As has been stated, GradeAunderA went into detective mode and found out most of those are faked (Same people getting "pranked", people defying laws of physics when getting "punched" and so on)
so it's mostly just a way to get quick views on youtube, the more extreme the "reaction" the more views.