I think the cop aspect is interesting because: He is a professional commenting on his own profession. If the topic would be sanitation, Joe Plumbers opinion wo

I think the cop aspect is interesting because: He is a professional commenting on his own profession. If the topic would be sanitation, Joe Plumbers opinion would hold more weight. He is speaking against his own colleagues, which might have negative consequences down the line, and has no apparent personal gain in doing so. So he is more likely to be honest than disgruntled joe plumber.