Suppose that you could have some sort of “clairvoyant knowledge” of whether a person belonged to a murderous group. You could then avoid interactions with members of that group, say by remaining in a segregated community.
Clairvoyance, of course, unfortunately does not exist. But you could get a similar benefit by learning from the past experiences of other members of your group in interactions with other subgroups, especially if it’s encapsulated in easy-to-remember memes/sayings.
You know what that “collective wisdom based on past experiences” is called, right? Stereotypes. Drunken Irish, airhead blondes, violent blacks, etc.
Of course, in practice, even a community of convicted murderers doesn’t kill every new person they meet, the first time. But if there’s any risk at all that trusting others too much before they’ve earned that trust will result in you immediately “losing the game,” and if such crime statistics can in any way be validly associated with particular, identifiable subgroups, it follows immediately from that that the holding of valid stereotypes about those groups will be a superior survival strategy to simply trusting them until they betray you.
Kirsten Brydum was traveling across the country with an Amtrak pass and an old bicycle. She was meeting with fellow Marxists around the country and campaigning for Obama. Fresh from protesting the RNC National Convention, she arrived in New Orleans by train. While bicycling around New Orleans’ all black 9th ward ghetto to campaign for Obama, she was shot in the head. Residents would not even call the police to notify them that a dead white girl was laying on the sidewalk. Her body laid in the streets for hours until a construction crew drove by and noticed her.
Even the New Orleans police issued a statement saying “robbery does not appear to be the motivation.” All evidence suggests that she was murdered simply because she was white.
That girl would still be alive today, if only she had believed the “racist” stereotypes about black violence.