So he was overzealous in his effort to protect the environment from the strange chemical, radiation, and existentialist hazards the Ghostbusters presented. There is no excuse for harassing people who were sleep deprived in dealing with the practical issues of confirmed life after death.
He came there to make a name for himself by pushing people around who were in the spotlight of the moment.
Also known at the time as “Pulling a Rudolph Guiliani”