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OK.
I could have been clearer and asked "So, if some in the government say you must/must not do A because then riots may happen and they have plausible grounds to believe this, does this have form in the UK? And if so what was the reaction last time?"
I don't feel like boiling it down to simplisms, just feels strange to me for people to suggest "there will be riots so we just suspend all parliamentary decision making and have to do this thing cos you say so"
A comparison of poll tax and failed/flawed brexit project is pretty pointless apart from perhaps a parallel of realised and potential civil unrest, politically and moralistically speaking.