I don't know how you define "scale", but if you do define it to encompass externalities then I agree with you. My point is that some types of problems are more

I don't know how you define "scale", but if you do define it to encompass externalities then I agree with you. My point is that some types of problems are more amenable to personal activism (participation in wars come to mind) while other types of problems (shared-resources/commons) have different effective solutions (taxes, legislation, democracy et. al.)