Just my non scientific thought on spiders.
I try my best not to kill any spider. From what I understand, spiders eat Mosquitoes, and other bugs. I have been bitten many, many times from mosquitoes, but I can not (for sure) remember one time being bitten by a spider. My thoughts are if I kill a spider it will allow (X) number of mosquitoes to live to bite me. I will allow all spiders to live, even the brown recluse.
I know that people in my area, often see a brown spider and instantly incorrectly identify it as a brown recluse.