Then everyone hiring an attorney for legal advice/representation is an idiot since they could just go ask a member of law enforcement for the same service fot free.
You are very wrong...
LEO responds to what they believe is an infraction of State/Commonwealth Code (i.e. Legislated Laws).
LEOs are NOT lawyers... they are arresting agents of the Courts.
Many times the DA or CA backs them... but many times the DA or CA does not back them.