You know, everyone hates that guy, but he was the only reasonable person in that movie.
Ghosts aren't real, and the Ghostbusters were reckless. Egon and Ray built an unstable containment apparatus without permits or inspections in an old firehouse with shoddy electrical wiring. They built back-pack carried laser weapons capable of annihilating a city block with an errant crossing of the streams.
Ray also manifested StayPuft Gozer.
Venkman was a charletain and a fraud, as well as a narcissistic sociopath.
Winston was just a guy they hired off the street.
Shutting down their nuclear "ghost containment" apparatus was the responsible thing to do. Walter Peck deserves a medal, or maybe a prosthetic device for his downstairs mixup.