Well USA do gas people all the time on protests and cop raids. They even used real deal Zyklon B to fumigate immigrants at border prior to WW2 (both theoretically non lethal doses though afaik some people did died or had other health problems) there was also over 600 executions in gas chamber.
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Tear gas is bad not equivalent to gassing in the concentration camp sense. The US has stopped using Zyklon B and is still fascist.
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