Mr. Gregory Devry (No. 95) - S3-E11
Stupidity: Ressler and Navabi arrive at Janet MacNamara's location, and while the receptionist checks where she is, Ressler thinks that's the perfect opportunity to ask Navabi if she's OK, given the whole sex/firing thing. He says, "You didn't say anything on the way over," so there was a bit of a drive when they could have spoken about this privately! Instead, he gets a weird look from the receptionist who's privy to this entire discussion. Cheaper than filming a conversation in the car, presumably.
The Forecaster (No. 163) - S4-E10
Stupidity: Farnsworth tells Charnquist they've been compromised by a girl listening in on their phone calls and that Charnquist needs to take care of it. He is able to identify the girl, elude FBI, tries to burn his apartment down, is able to gains access to Maggie's apartment and knock out Aram in order to kidnap Maggie. He's a killer who works for someone who has arranged dozen of murders, and knows "take care of her" means kill her. There is absolutely no reason for Charnquist not to have just killed Maggie, Aram, and Fiona. He had opportunity and he ends up killing 3 cops in order to kidnap her and kidnapping Maggie would not have solved anything.
Mako Tanida - S1-E16
Stupidity: After the attack on Ressler and Audrey, the thug shoots Audrey, partly just because he gets the opportunity, and to distract Ressler. Ressler then turns around and runs to Audrey; the goon shouts, "We gotta go," and they leave, despite having a clear shot at Ressler from behind, their prime target. What, he couldn't take a second to finish the job?
