This blog post is highlighting their specific contribution to the UK government's open consultation[1], not a general call for sanity. There's a link to their open letter at the end of the piece. No doubt they will write other authorities when the need arises.

[1] https://www.gov.uk/government/consultations/growing-up-in-th...

So your strategy when you are trying to change someones mind is to mention a lot of other people think like the mind you are trying to change?

Could you explain what is the theory behind that?

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