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Doesn't work very well, because police do in fact set up roadblocks for any number of reasons, such as drunk driving "checkpoints", and for that matter borders. Anyone using that analogy would just trigger a response of "but SOPA only targets foreign companies, and we do set up roadblocks on our borders".

Using an analogy to aid understanding can seriously backfire when your opponents make fallacious arguments from analogy, because the audience doesn't actually understand the issue so they go with whatever the analogies makes believable.

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