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RE: Human Vision has Evolved to Detect Snakes
Definitely a plausible conclusion! So perhaps it's still just a theory because while it has been proven in most test participants, there are still a few outliers that call the results into question.
Well, a similar case would be the disappearance of the wisdom teeth. Some people are already not having them. As I explain in my article: having them does not kill you. So, humans rely on random mutations until they vanish from our race.
In the same way, not having the snake detection trait does not kill, most, of us. So, we also rely on random mutations.