That's what you'd expect them to do!
You fell victim to one of the classic blunders - The most famous of which is "never get involved in a land war in Asia" - but only slightly less well-known is this: "Never go in against a Sicilian when death is on the line"!
If he was Fosterized wouldn’t they have been smart enough to at least steal something to make it look like a robbery....They stuck Vince’s pistol in his wrong hand...with his thumb in the trigger guard. No they figure everybody is so damned stupid, they won’t question clues.