One flaw that is known is that sharks are color blind. So when they are deep in the water and they see an object above them they think food. When a person has flippers on or and are using a kickboard, the shark associates it with a seal. Seals are one of the main animals that sharks eat. When sharks want to catch their prey, they start low and rapidly ascend to take their prey by surprise. By the time the prey sees the shark coming it is too late to get away.
Another flaw is that they are more of a survival mode. When food is around they go