If squirrels eat from a bird feeder, it will not attract many birds  However, squirrels eat from a bird feeder only if it lacks a protective cover
So a bird feeder will not attract many birds if it does not have a protective cover
If a tire's pressure is too low, the tire will wear out prematurely. But tire pressure will become too low only if the car owner neglects to check the pressure regularly. So a tire will wear out prematurely if the car owner neglects to check the pressure regularly.