For example, most of modern consumerism is OK if we do a little bit. But if everyone does it, becomes environmentally destructive.
Or drug taking which would be fine for a few researchers, but becomes damaging to society if everyone is off their heads?
Or competative behaviour by Microsoft, which would be tough but acceptable from one of it's rivals, but destructively distorts the market when done from this position of dominance.
But for the utilitarian, how should blame be apportioned if the group goes over the threshold? Does it all fall on the last actor, who pushed the total behaviour over the limit? Does it fall partly on earlier practitioners who would oth erwise have been blameless?
What if everything is like this. Perhaps any action is harmful if performed in too large quantities. (This might be a big problem for Kantians?)
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