I wonder if they even take antibiotics?? Anyway...
This is how far some go to prevent harm. AFAIK, people weren't designed to live that way. So we can be forgiven for being what we were made to be.
The thing about global warming is that 30 years ago we all thought we were going into an Ice Age. And we can't predict the weather three days in advance with the same technology that they use to predict global warming.

Also, you can make a pact with Spider. Do a little ritual to tell Spider that you love and respect her, but if any of her children get on you or in your space, they will have to meet their maker. No apologies needed. That way, you don't have to feel quite as guilty about them. After all, the guiding spirit will hopefully take care with that bit of info to keep her children out of your way.