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Glad the question seems weird. Here is an American officer’s answer to the same question: It makes for good press and it makes the sheep feel good when they hear that a sheepdog prevented a suicide. But, in the end, the wolves need to be culled and the lives of the sheep don't matter. Most civilians don't respect the police enough, and fully one-third of Americans have a criminal record, so a police officer is taking a risk that they're just enabling a criminal to live another day and to commit more crimes.