It was not a mistake
Man investigates a break in at neighbor’s. The would be robber attacks him with a knife. The man shoots him dead. The perp turns out to be the man’s 15 year-old adopted son. Now, that’s pretty awful. But it was not a mistake. Via Tam, who says:
Had this happened on your home turf, the papers would be wondering why an innocent and apparently much-loved elementary school teacher was carved up by his own son. Do you have a preference as to which of those stories you’d rather read? I know I do.