I don't like to frighten you but I think you need reality. Talk to your local animal control to see what potential predators are in your area. Even if you are urban, in Wisconsin I'd be amazed if you don't have rats, possums, raccoons, skunks, fox, wildcats, coyotes, weasels, hawks, owls, and the most common threat, both feral and pet dogs. You hardly ever see them. Part of that is that most mostly come out at night but they are excellent at hiding and are often kept away by human activity.I hadn't thought about rats. I will have to look into how prevalent they are in my area.
Most of us in North America have most of these as a threat, even in urban areas. Just because they are there does not mean that they will attack at once. They don't, many of us can go quite a while without an issue. But that potential is always there. You never know when they will strike.
This goes back to where this thread started. You get a lot of storis of the disasters, predators not attacking is not a story so you don't hear about those. Dad had a flock that free ranged in the middle of the country. Some slept in trees. Predators were all around. In all the years of my growing up we had two predator attacks, a fox and a dog. Both were shot.
I don't like frightening you but I do ask that you take predator protection seriously. Especially at night.