Since S points to Y, and Y is the target quantity, according to this coarse selection diagram, the causal relationship is not transportable!!!

University of Michigan - Ann Arbor

X : X = 1 --> Plays Russian Roulette ;  X = 0 --> Doesn't play Russian Roulette
Y : Y = 1 --> Dies ;  Y = 0 --> Survives
S : S points to Y because of the disparity in the base mortality rate of the two cities.

Coarse Selection Diagram

Cinelli, Carlos, and Judea Pearl. “Generalizing Experimental Results by Leveraging Knowledge of Mechanisms.” Technical Report - UCLA, 10 Dec. 2019.

https://ftp.cs.ucla.edu/pub/stat_ser/r492.pdf

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