How do you feel about people trying to "backseat quarterback" someone in a line of work they don't even do?

For example civilians who criticize police or military personnel and how they are trained?

Me personally, I think there is a line that people can voice their opinions before they need to shut the fuck up. A physician wouldn't tell a nuclear physicist how to do his job now, would they?
How do you feel about people trying to "backseat quarterback" someone in a line of work they don't even do?
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