I suspect part of the reason #15MinuteCities took off in Paris but have spawned conspiracy theories in the UK is that #AnneHidalgo invested in the benefits alongside the traffic calming measures, whereas UK councils had no budget to invest in the positives and also no budget for proper public consolations explaining what was going to happen so people felt it had just been dropped on them without warning.
"Critics of #LTNs argue they benefit people living inside them largely by pushing traffic on to nearby roads. However, the DfT said this did not seem to be the case."