Many Experts Give Advice

Many cops enforce the law that they seldom follow.
Patrols serve as a seesaw
though they're often hollow.
Many mentors teach a course that they seldom follow.
Lessons serve as a resource
though they're often hollow.
Many doctors prescribe cure that they seldom follow.
Treatments serve as an allure
though they're often hollow.
Many clerics preach virtue that they seldom follow.
Sermons serve as a curfew
though they're often hollow.
Many parents define play that they seldom follow.
Cautions serve as a waylay
though they're often hollow.
Many experts give advice that they seldom follow.
Tactics serve as a device
though they're often hollow.