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America has plenty of mass killings in states with the death penalty.
Results are what matters. Kudos to penal systems that actually understand that instead of kowtowing to public pressure.
They're at like 20x the US for 2009-2015. Even if you do the total rehabilitative 20 years or so of data they're at least 4x worse than the US in per capita mass shooting.
https://worldpopulationreview.com/country-rankings/mass-shoo...