I think most people do have parasites. I won't give up my animals. They are all part of my family.
I'm not crazy dressing my dog up in a baby dress and pushing her in a stroller or anything, but I do love her. ;) The cats I could really take or leave. Two female torties. Gawd, they're cranky. The horse gives me so much joy... Cheaper than a psychiatrist.
So perhaps the answer is 'maintenance' deworming for us, too?
I'm a wee bit OCD with hand washing so it is a complete mystery how I've become infected. Obviously, that's not enough.