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I believe what you talk here about is the placebo effect. That’s not a method. And what you recommend sounds a lot like an embargo on negative results which is definitely NOT OK.
I'm not recommending anything; for me "there's something harmful about X" doesn't imply "...so we should stop doing it." I think lots of things are harmful, cost-benefit analysis is complicated, so is figuring out how policies should be decided on, etc. etc.
