Why was no attention made in Fargo about Malvo's accomplice, Chumph, being duct taped to a chair and a gun duct taped to his hand? This would be proof there was someone else in town, doing bad things. The cops shot him and there wasn't another thing about the incident in the series.
2 Answers
We can't say that the police ignored this fact. Of course they would have taken notice and known that someone else was involved. It's just that this part is not discussed in further story. If you look at the complete story from the beginning, there were a series of bizarre events which baffled the police, but the police is shown kind of helpless and clueless, unable to crack the cases. I mean it is not possible to show each and everything in detail. So I guess the incident you mentioned was just another one in the series of events happening in the town.
And to answer you question specifically, I would say the police did not ignore the fact or forgot about the case. They were just unable to figure out "who & why" aspects of the case.
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3Well, I'm not so sure: Malvo hears in the radio that "It was the weirdest suicide by cop that they've seen". The show likes to point out that small-town police officers are not always the brightest stars.– YasskierCommented Jun 27, 2019 at 1:09
Actually, if you listen, as this scene concludes, and we transition to Malvo, listening over the police scanner from his car, you can hear a police officer say "looks like suicide by cop."
... tho, that'd make a nifty trick with the duct tape, I agree.