Cops are more trustworthy than the average person? Really? In what universe?
Who gets to be a cop? (At least, by rules which used to exist.)
Are they people with bad financial records, crushing debt and loan defaults. People who've been arrested and show a disregard for laws? People who use recreational drugs (besides alcohol, but that's another subject.)? People who have a record of dishonesty in lying? In many departments still, people who engage in sexual perversion (homosexuals?)
When I hired on as a police officer years ago, any of these would disqualify you from being a cop.
Some people ARE more trustworthy than others; to say otherwise makes you a liberal.