system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are so many people afraid of cockroaches although they are relatively harmless?

I know that they're filthy and all, but what is it about roaches that genuinely terrifies people and evokes such an instinctive response?
gpt
Roaches tap into our evolutionary fear of dirty things. Humans like to control their environment, but roaches are very difficult to kill. They can adapt quickly to most poisons and they can survive on almost anything.