My first impulse on reading the parent comment was an urge to note the difference in propagation speed between the inflammatory political cartoon and the manipulative tweet. On reflection, I think the impact of this delta is more than balanced by the resources a critical observer can bring to bear in the context of the process as it exists today. That being said, the political process in the US seems designed to marginalize critical thinkers trying to arrive at sound public policy, leaving the field to those forwarding and protecting private agendas. The national conversation, such as it is, is driven by those parties most adept at injecting noise into public communication channels.
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