I doubt being a semi auto would have effected the medias outlook, semi auto pistols are just the norm nowadays. If he would have dropped a whole mag into this guy, maybe so, but he'd still probably go with out any charges at all. I to recall "trigger happy", and the news saying that it was "a mistaken identity lead to him being shot". The only mistaken identity made was the drunk thinking he was smashing his own house, someone breaking into your house is a threat to you and your family, regardless of who they are.
And whats to say this guy breaks in see the victims there and doesn't go into a blind rage because he thinks that they're in his house?