There's definitely use to destroying an object in a nose dive. For example, if the device is on a ballistic trajectory, you'll separate it into smaller components increasing drag and lessening the damage by spreading it across an area. If it is explosive, you may force the weapon to detonate prematurely, reducing the threat of the explosive. If the device is on a controlled flight path, you remove it's ability to control. If the device is not a missile, but rather a vehicle, you've eliminated the vehicle's ability to deploy arms or perform reconnaissance.