Lots of internet bravado being displayed here. Some I believe, others, not so much. It's hard to learn any useful lessons from this incident without ANY details...or facts. Shooting (likely killing) a person is NOT a natural human instinct. Many people find that it may be harder to pull that trigger than they think, thus giving a warning feels more natural, giving the possible criminal an "out". OR...a homeowner could be confirming that the suspect was not a family member, the stakes are too high for mistakes.