Their owners started with a tiger kitten in town or in a small area. When the cute, cuddly kitten became a several hundred pound teenager, their owners didn't want them anymore. You have to adjust your life to fit theirs. I was surprised to learn that man is not on the tiger's food chain. They consider us carnivores like themselves.
All carnivores have forward facing eyes, like man.
Tigers recognize this. Prey animals have eyes on the side of their heads so that they can see their hindquarters. Tigers recognize this also. Again, man is not a prey animal. This does not mean that a human can't get hurt around a tiger.