It can be startling to come across a spider when one is not expecting to, but in many cases, spiders do good work that humans should appreciate. Orb-weaving spiders often catch flying nuisances—such as mosquitoes and flies—that can cause actual harm. Orb weavers are not aggressive, and their venom is nontoxic to humans.
Spiders are one of the only ways that the environment keeps a handle on the bug population. Without spiders, there would be so many more flies and gnats. Spiders depend on these animals to survive. People have a fear of them, but in the end, the spiders help out by looking for insects to eat.
Whilst many people are scared of spiders, the overall fear of spiders doesn't weigh to paranoia. People as a whole do not have much interaction of spiders outside of the occasional surprise.Most people consider spider's a pest but not very dangerous or "evil". Spiders bring a lot of value to the ecosystem and if more people know their positive contribution, the fear of spiders will reduce.
No, the value spiders bring to the ecosystem is not outweighed by the fear many people have for them. Many of the fears people have are completely irrational and could be eliminated if people understood spiders better. They do have an important place in our ecosystem and most people would agree that they are important. They just need to be educated.