I suspect a rung doorbell correlates with a lower rate of criminal intent than would a stealthier type of nightly contact, such as someone snooping around or quietly tugging on door handles.
My response would vary depending on what I observe, and who else is with me in the house. The wife and other family are all gun-friendly and have some training, so having a full house means I'd have a lot of help should anything crazy go down.
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