They may down vote because they don't like the poster, they don't like what the poster had to say, or in this case more than likely outraged at the behavior being discussed.
I personally up voted your article because I believe it is important to discuss.
I don't mean to speak for any of those who did down vote your article. If asked, they should explain why. (I always try to if I notice someone asking, and sometimes it generates good conversation).
But in this case, I would not see any down votes as a negative against you, or you posting this content for discussion.
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