If, after years of one side saying Brexit won't make us poorer because German car manufacturers will make the EU give us a deal, those same people push No-Deal...
One side will forever be seen as liars.
Every time anyone on the Remain side said Brexit would damage trade the Leave advocate would say "You really think they'd let that happen? They need us more than we need them. We'll hold all the cards and get the deal WE want".
L: Let's leave!
R: Don't make us poorer!
L: We won't be poorer. We'll get a deal because the EU need us AND we'll take back control.
EU: Here's full EU market access without following any EU rules.
L: See!
R: Guess we'll be ok
L: Let's leave!
R: Don't make us poorer!
L: Won't be poorer. We'll get a deal because the EU need us AND we'll take back control
EU: Here's market access but you'll follow EU rules
L: No-Deal then
R: You said we won't be poorer BECAUSE we'd have a deal
L: So?
After a fierce national dialogue where one side said Brexit would deliver a pure kind of sovereignty and wouldn't make us poorer because we'd get a deal, and THAT side won... When Brexit doesn't deliver that, the winners have a moral & societal duty to make it right.