And you are thinking with your emotions. You don't like rats so you want them eradicated. Which is fine for you - but "John99 hates rats" is insufficient reason to do anything. Especially given your well-presented disconnect with science.
Well, heck, if that's your criteria, we better exterminate bears, coyotes, dogs, cats, birds, raccoons and squirrels as well.
Again, given your remarkable imperviousness to science, I'll take your scientific opinions with a grain of salt.
Nope. No one needs any pets. But they were fun to have.