Polar bears typically inhabit remote and harsh Arctic environments where human populations are sparse. Unlike brown and black bears, which have had more historical interactions with humans, polar bears are less accustomed to human presence. As a result, when they do encounter humans, they might not have the same level of familiarity and can potentially perceive them as a source of food.
When polar bears see a person for the first time, they might not know what it is because they’ve never seen a human before. They might think the person could be something to eat because they don’t understand that humans aren’t food. This makes encounters with polar bears very risky because they might see people as something they can catch and eat.