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That propension didn't appear randomly either, it is the result of millenias of hard lessons learned where those outside tribes were indeed threats.
That learned behavior still dictates our actions today, except for some of us, the notion of "tribe" has been enlarged to include a vast number of people, or, for the most idealistic, the entire planet.
https://news.ycombinator.com/newsguidelines.html
Using a throwaway account to make a needlessly incendiary comment is unproductive. If you're not willing to put your main identity behind a comment, maybe consider if it needs to be rephrased rather than hiding behind a throwaway.