Yeah, West Nile, Malaria, and Zika definitely don't sound like a menu of fun.

I think people fear spiders for the fact that they're kind of creepy. The way they watch from the shadows, trap insects and devour their blood, drop down unexpectedly, and have eight legs and eight eyes is a bit unsettling, but yeah, they do help a lot with pest control. Although I have seen what a bite from a brown recluse and a black widow can do and it sure as frick isn't pretty.