avg height on your island will be a weighted avg of avg heights of source-populations
avg lifespan will be a weighted avg of avg lifespans of sources
Some stats might be changed in new envir'mt or by cross-group interactions, but 1st-order they result from avg'ing (by hypothesis)
& also you can't just bring murder rate to 0 w/ strict criminal law, b/c again: linear combination of subpopulations
(Have we drifted far away from "is politics meaningful," "is originalism coherent"? Be patient...)
shylockholmes.blogspot.com/2017/07/on-tim…
Even for demographics, there are more complex possibilities than linear combination of traits (like tribal coalition-formation and rivalries)
This is meant to be demonstrative.
cannot be linearly combined with
"Normal politics result in [demographic changes] that determine the level of [social ill]"
One way of asking that question is: Does the amount of difference you can make on political outcomes justify research, donations, canvassing, going out to vote? Almost certainly not.
I don't disagree w/ this!