Why do people want to stay close to home for college?

I know a lot of parents who want to keep their children close by for college. I understand that desire if it is based out of financial or practical concerns (can’t afford the transportation, ailing grandpa who child needs to visit, etc.) but often it seems to be more of an inability for the parent to let the child go. Some children can push past that and still cut those apron springs, but I think there are others who would benefit from being encouraged to leave the nest and fly. Colleges routinely complain about students who are fundamentally unable to thrive on their own these days and some of the same parents I know who want their children close by for college might be the ones contributing to this lack of self-reliance.