The West had laws, but they were far away. Use a "Wanted" system. Every crime increases their Bounty. If the bounty gets high enough, a "Pinkerton" (elite lawman) or a "Bounty Hunter Crew" will track them using the tracking rules in the PDF.
GUN&SLINGER is a unique, cinematic tabletop RPG designed for tight, episodic play on a "dead planet". It stands out by being specifically built for two players and a Maestro (GM), where one player takes the role of the (the wanderer) and the other plays the (the sentient weapon). Core Concept & World gun and slinger rpg pdf
Players answer prompts and questions at the start to build a bespoke setting together. PDF Content & Expansions The digital PDF (available via The West had laws, but they were far away