Why were the gulls and cats not afraid of the bald eagles?

I just had the pleasure of seeing bald eagles for the first time. I went with a group to the Susquehanna River power station near Chesapeake Bay. Most of the birds were gulls, which showed no fear of the eagles. For some odd reason, there were also a bunch of feral cats on the shore. I know that bald eagles eat mostly fish, but they do eat other animals.