Most cats will follow a human, as will most dogs. It is also a known fact that holding and/or stroking an animal,cat,dog, or whatever, has a calming effect on humans.It isn't so much taking away negative energy as taking away "stress";especially of people who live alone. A cat or a dog is the most wonderful companion! But there is a difference. A dog is a pack animal, a cat is a "loner".
You can "own" a dog, but the cat "owns" you! A dog will stay even if treated badly. Treat a cat badly and you will never see it again!