system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do so many people have a primal fear of spiders when only like 1% of them are dangerous?

Personally I am terrified of spiders but I have no issue with snakes, which I rationally know are much more dangerous.  What's up with my brain?
gpt
Because 1% is actually a pretty high number. Would you get into a cab if you knew that 1% of them exploded before reaching their destination?

Yes, most spiders aren't dangerous. But the ones that are? They can be dangerous enough that we evolved this reaction to spiders -- especially since there's no evolutionary downside to avoiding all spiders.