Why are thinly veiled racist threads continually allowed in GD?

The easiest example of this is “looming genetic crisis”. The SDMB is the 3rd result.

As for example of the numerous threads this group has started:

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Nine

I only stopped there because I was tired of waiting to search, and skimming through threads. This post gives you an idea of what I am talking about wrt to constant regurgitation of discredited cites and nonsensical drivel:

Here are a couple of pit threads discussing the same thing I am complaining about (see here, here, and here). Please don’t act as though I am imagining this.