I wonder if you would say the same when some intruder gets a sympathetic jury to send you away for voluntary manslaughter while he gets off scott free for your taking a few shots at him in your own home. As WW mentioned, Castle Doctrine is the subject and there are already cases showing you cannot simply feel threatened in your own home, even in a burglary, take action using a weapon, and then avoid getting charged with a crime in some states. Part of owning a gun is knowing the local laws. Pretty good advice.

Wiki on Castle Doctrine
Castle Doctrine and States Laws