Peck: maybe he was right?
The movie clearly portrays him, the EPA agent, as the bad guy. In fact he was:
1- following the lawful rules and regulations.
2- working for the environment protection agency, and doing what his job entails (enforcing the
law).
3- stopping the ghostbusters from repeatedly breaking the laws.
I personally think he's the kind of man that should stfu, just an impediment to progress and does't understand when something is good to be outside of the established rules.
If it were for these people, we would be still living in caves.
On the other hand, these kind of people have to deal with hard stuff on a daily basis: how many criminals has he rightfully prevented for doing exactly something like the ghostbusters do (which is, running a totally outlawed power grid endangering the community/environment)? How was he to know that the ghosbusters were the exception? (hint: see what kind of dick is Venkman when Peck starts the inquiries)