Mr. Monk and the Big Game - S5-E3
Stupidity: It makes no sense for the murdered coach's brother to stick around since they were getting close to him much less attend the game.
Mr. Monk Gets a New Shrink - S5-E7
Stupidity: Merrigan should've removed the heroin from the statues once he got them, thus the whole murder of the cleaning lady and discovery of his drug dealings might not have been discovered.
Mr. Monk Can't See a Thing - S5-E4
Stupidity: In the beginning, Natalie walks into the firehouse, sees two people hurt, and instead of calling 911 EMS, she calls the captain, delaying the EMS services.
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