Humans aren't social and use fire to repel insects... nor does being social or in a group stop an insect? Arachnaphobia doesn't go away cause people don't want bit? People are scared of bees where unless your allergic it does nothing, people are scared of ants for the same reason. Cats are scared of snakes because snakes are silent. Snakes feed on cats when possible considering a ton of snakes couldn't eat a full grown cat. I get what your saying it's just in practice, my kid isn't scared of spiders. I am almost not scared of spiders, is that because evolution? No I learned how to deal with spiders and stopped being scared (ironically same with bees, just don't bother them and they don't bother you)