These planes can fly for miles as did this one in the video. The owner isn't going to be running up to anyone after a crash because he'll have to get in a car first and drive over.
If your going to be flying something though the air that has a large range and can seriously hurt someone or damage property, it's not to much to ask that it be registered somewhere. Simple registration number so we know who the owner is.
Edit: The remote can also lose contact and the owner wouldn't know where the plane crashed to cover property damages.
By this logic, people should have registration numbers tattooed on their foreheads, so that if one commits a crime (or just looks at you wrong), we can immediately find it.
If your going to be flying something though the air that has a large range and can seriously hurt someone or damage property, it's not to much to ask that it be registered somewhere. Simple registration number so we know who the owner is.
Edit: The remote can also lose contact and the owner wouldn't know where the plane crashed to cover property damages.