All the homeowner has to do is say that the trespasser "moved a hand toward the area of his waistband", thus initiating the lawful use of lethal force. Everything's hunky-dory then. See:
"When officers arrived at the scene, Finch opened the door for the officers. As police told him to put his hands up,
Finch moved a hand toward the area of his waistband - a common place where guns are concealed. An officer, fearing the man was reaching for a gun, fired a single shot. Finch died a few minutes later at a hospital and was found to be unarmed, Livingston said."
http://www.foxnews.com/us/2017/12/30/kansas-swatting-suspect-arrested-in-los-angeles.html Oh, wait, THAT'S THE RULES FOR COPS who SWAT some guy as a result of a prank call. Completely innocent 28-year-old father of two young children opens the door from inside his own home, as he's ordered to put his hands up, one of them apparently moves in a direction meriting death, bang, he's dead. He was unarmed. Cop walks. Next. (Put your hands down at your sides in a normal standing position, now start to raise them, you'll notice that they "move toward your waistband" unless you're some kind of weirdo who "raises their hands" by sticking your arms straight out to the front or sides... I've never seen anyone do that... I'm just sayin'...).
I guess an ordinary citizen anywhere wouldn't be able to use that justification, much less one in Hawaii. Too bad.