I can’t recall if it was Flying Rodent who said it on Twitter, but what they said was that over time it becomes very clear that the 2017 & 2019 Labour manifestos held a lot of solutions to “oh no, if only…!” cries from centrists today, which is part of why they won’t bring it up.
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I actually had this argument with an old Tory friend and all he could say was "it would have been worse under Corbyn".