Yes and no.To a small degree police aka people to prevent rape murder and theft from happening in the open are needed. But we don’t need the specific people that make up the FBI or ATF or DEA or certain police departments. They could be replaced with anyone who is willing to use force and obey orders from ex army, former civilians, vigilante, gang members, thugs what ever. As long as those people are willing to accept following orders in the future.
It takes more then following orders for a good amount those agencies