In the case of the Japanese guy, he was acting all jittery and was making lunging motions at the door trying to get in while not exactly speaking English all that well. Although at the time right before the shot, evidence shows Hattori had stopped moving and put his hands up in the air. However, that doesn't remove reasonable fear from the equation at the time of the shot from the homeowner.
But any many pro castle doctrine states, someone doesn't actually have to break into the house yet to be considered a threat by the homeowner. There is a reason for this and why Mr Pears go acquitted in his case. Pears was frightened by a couple of teens coming up to his house fast and his wife's panic. While he later thought it was an over-reaction on his part, it doesn't matter in the heat of the moment. Yes he had a bad judgement, but it could have just as easily been a good judgement. For example, had the teens been out to do harm to him and his wife and he didn't go get his gun then he and his wife could be dead. While that wasn't the case, the idea of castle doctrine law is to side in favor of the homeowner and not the person being in a place where they aren't suppose to be. When home owners have to second guess their decisions to protect themselves and their homes then there is chance they end up being victims.
Yes there ends up being a chance where someone innocent is banging on the wrong door in the middle of the night where they should be and gets shot for it. But that should be the rarer occurrence in the case of law abiding citizens. Most people around here know not to show up on someone else's property where you don't belong in the middle of the night.
In this case, the person on trial didn't present he had a reasonable fear of McBride attempting to enter the house with what he said to the cops. Which is all well an good because you shoot if you aren't afraid. If you have to second guess yourself, or shoot on "accident" at a person then you weren't in reasonable fear and deserve the punishment of the law.