“As I understand it, the home owner’s first mistake is to boast his fire arm collection on social media.”
Arguable. Perhaps he wanted that exact outcome, as it certainly makes his local community quite a bit safer, considering their wrap sheets.
He wanted multiple armed intruders to break into his home and try to murder him? Why would anyone want that? That seems like an insane thing to want.
Kudos to the homeowner for taking down the criminals though. If someone is willing to enter your home with you in it, you have to assume they're perfectly fine with killing you. Burglars who are only there to steal things do not want a confrontation. They want to get in, steal valuable items, and get out without getting caught. Only a murderer is willing to risk a confrontation.