Although the survey approach described above would lead to "invalid" results, I would never argue that survey studies should be thrown out and that we should only be conducting RCTs. My point is that there are strengths and limitations of various study designs, and causal inference is enhanced by having research evidence from multiple study designs. On balance, the strengths and weaknesses balance each other out, leading to a much greater ability to draw valid conclusions.

It is perfectly reasonable for the government to intervene to prevent companies from making false or misleading claims to the public. Even severe infringement of free speech by corporations may be justified in the case of preventing the deception of consumers. However, there is little justification for prohibiting companies from telling consumers the truth, and there is no justification for suppressing the truth when those facts are the most pertinent information that the consumer needs to know in order to make an informed decision about using the product.

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