Its definitely not acceptable in the UK to save more of a shops property by murdering someone, that is a sure fire route to jail for life for a police officer and rightly so.
The answer is the insurance company. Property isn't worth more than a human life but I know in the USA they do have the premise of defending your property lethally, we don't have that in our culture we don't believe in capital punishment regardless of the crime. Shooting a man for property damage is a conviction and sentence to death by a police officer, that is not OK this isn't Judge Dread.