Does this mean that if overall there are more people worse off then it's the wrong decision
Only time will tell. Point is that majority voted out. I can't think of a fairer way to run a country other than to act upon the vote of the majority.
Not possible to ignore a vote because the minority think the majority made a wrong decision and therefore the majority vote must be ignored. People are entitled to vote how they choose and they are not obligated to explain to others their reasons.
but that the pain will be worth it for some abstract esoteric benefit
Possible that is what some think. Not everyone votes solely on the basis of money. Labour are renowned for high borrowing and high taxes and wrecking the UK economy, but they still get votes. Conservatives are renowned for making the well off more well off, but they still get votes.
Many couples who divorce end up worse off financially, but are more well off mentally and happier. So they vote based on issues such as; freedom, no longer being controlled, no longer subsidizing non contributing partner, etc.
An individual MPs performance and opinion on QT can't trump months of work on the government's full official detailed impact assessments surely?
Maybe the MP's on QT have researched for months as well?
It is very easy to manipulate and cherry pick numbers and statistics to suit your own argument. For every argument there will always be a counter argument.
It is not possible to please everyone at the same time. Hence public are requested to Vote. The option that receives the most votes is the one that has to be acted upon.
If people come to the conclusion they got it wrong in the past they can change their vote in future as happens in General Elections. However, the result of the General Election has to be implemented. If voters think Government is doing a bad job they can vote differently at the next election.
The fact the gov initially tried to suppress this info speaks volumes
Government tried to suppress the legalities over the Irish Border issue in the hope that T May's WA got through without people being aware that UK could be locked into the EU forever even though 39 Billion had to be paid to leave! Once that fact came out the T May WA was shot down over and over. Even the remain MP's and most of Labour said it was a bad deal. Some thought the terms were worse than what UK currently has with EU.
Some forecast before the referendum that UK would go into instant recession just by voting to leave even before leave actually took place. Did not happen. Now even Carney is saying that things are not as gloomy as once thought.