You probably don't live in a tropical country. If you left spiders in your house alone, then within a week the place is filled with cobwebs littered with dead i

You probably don't live in a tropical country. If you left spiders in your house alone, then within a week the place is filled with cobwebs littered with dead insects. Also, many spiders give you rashes even if they don't bite you. And spiders tend to attract each other.