They don't have airborne predators and if you watch a large flock of them they often bump into each other in flight.
i think that’s true of most large birds. Buzzards/vultures seemed totally oblivious to us - almost like they can’t see us and their brain says “computer says no”. Took out two while hover taxiing to land. First one exploded (a 212 blade will do that), buddy was amputated at the wing root and catapulted into a storm ditch. It appeared a few minutes later, hopping around looking very unhappy.