It's wrong to exclude people from public areas
Dean is a police officer whose patrol is around the public park.
Dean wants to keep the park clean.
Dean tells park visitors that the park is open, but they have to clean up after themselves.
Dean tells park visitors that the park is closed and can't be used.
The visitors will enjoy the park and Dean will be able to maintain a clean park.
The visitors will not be able to enjoy the park and will report Dean for misconduct.