Why are lions and tigers so aggressive towards human beings?

They don't… lions and tigers are in no way aggressive to humans. They don't find us all that threatening but if you're near one and it's hungry it will eat you. Animal like dogs and the leopards that rich people have are raised from birth around humans and taught that humans feed them and aren't themselves food. read more

It would attack people. Exactly the same as the Lion and Tiger, attack the human beings. This behaviour of the cats, that you describe in your query; may as well indicate that the Cheetah is afraid of the pointy-ends, on the sticks. They ascertain the risks and also know that the people are harmless, if left undisturbed. read more

An employee at the Cat Haven Wildlife Sanctuary in Northern California was mauled to death by an animal she had described to friends as “her favorite lion,” CNN reports: The victim’s grieving father said the lion, Cous Cous (who once appeared on Ellen DeGeneres’ television show when he was about three months old), was one of her favorites. read more