people have thought they have the right to shoot anyone in their house and have gone to jail for murder. You have to be able to show you thought you were in mortal danger and feared for your life... you will be given the benefit of the doubt if possible, but I've read stories like... where multiple people break in and when they saw the owner with the gun they basically stuck their hands up and were running back out the door, and he shot and killed one of them in the back as he was running toward the door... after testimony by all observers, he was still charged with murder, because his life was not in danger, and the intruder was trying to leave.
If you see someone grab your Macbook and start running away with it, and you shoot them... your probably going to prison, because in most US states you do NOT have the right to protect your property with lethal force, only to protect people.