

I’ve heard that as well; and claims that they are essential to keeping the sewer pipes clear. Not sure to what extent I would put stock into all that but they are certainly a pest. Disease, filth, destruction of homes.
My city ultimately considers them a pest considering there is a tax-funded public pest control office fighting rats year round. People can call them and they will come to the home and deploy rat control measures (usually poison) at no cost, just like a pro exterminator.
For me, rats are filthy, gross, and creepy. But that is not why I fight them. I normally would not care about their presence as long as they stay on their side of the walls. But I fight them for two reasons: