Should have used a 12 gauge .
One well placed shot would have ended it pronto.
He broke the law(as it is written in Minnesota statute)
That said, I’m not losing any sleep over dead robbers and Mr. Smith goes to prison.
But I doubt Smith is/was a threat to anyone on Earth other than people sneaking into his house or he’d probably killed other people before making it to age 65.
What law did he break?