Comment: I think you are correct about this.

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In reply to comment: I don't either, I think it's (see in situ)

I think you are correct about this.

It's not an overt decision made at the point of the contact.

It is an ingrained subconscious pillar in the psyche of police, like a "default setting" which you mention.
Their minds are not their own. They are fully owned and operated by another, like robots.