Don't be so ridiculous
The majority of burglaries/house breakings are just that, they enter to steal property not harm / murder people!!
You have a very naive black and white view on things, what’s to say he doesn't have a starving family at home too feed or has a horrible drug addiction? Does someone deserve to die for this?
Unless your dad was genuinely in fear of his life then I hope he gets banged up for murder and the key thrown away! Civilized society has no time for pathetic and over the top vigilante 'justice'.

Pathetic post.