Mr. Monk and the Panic Room - S3-E2
Factual error: Disher hands Stottlemeyer a pistol and tells him that he just unloaded it, but Stottlemeyer just takes his word for it instead of double-checking it. You NEVER, under any circumstance, take anyone's word that a gun is unloaded; you always check it yourself. As a police officer, Stottlemeyer would know that.
Answer: Stottlemeyer was already upset after the phone call. He was trying to get "Kevin" (who would have to be a judge, but no further character information is given) to issue a restraining order with no evidence of needing one, except that Adrian Monk said she needs one. Kevin said he would need to "sleep on it." So it's clear they've been trying to provide protection and unable to get the results they need, which seems to be based on no one trusting Monk the way Stottlemeyer does. He's just angry that they failed to protect Linda despite all their work. Although it does feel like a scene was cut, or altered, from the show that shows the futile attempts to protect Linda which built up to his outrage.
Bishop73