If I see a spider, along with any other insect or animal in my house, I kill it or get it out. I'm not against spiders, I just don't enjoy other animals mooching off of my shelter.
where i live black widoes(go figure) can kill alot of people and its more harmful then i snake bite. my 18 year old sister got bit on the let and for a week it sweld up and it was really red and made her very sick.