The reason why cats are afraid of falling is because they are born with excellent balance ability and quick reaction ability. These abilities allow cats to maintain balance at high places and quickly escape when danger suddenly arises. Therefore, cats' fear of falling is mainly based on instinct to protect themselves from injury.
In addition, cats may also be afraid of falling because they are overly excited or anxious. For example, they may accidentally drop it while playing or running away. In this case, the cat may be afraid to climb up again because they are worried about falling down again. Generally speaking, the reason why cats are afraid of falling is to protect themselves from injury. They are born with excellent balance and quick reflexes, so they rarely actually fall.