The people of the UK never voted to join such an institution.
They joined a common market that was later, without seeking their ongoing consent, to evolve into an organisation no longer about trade but increasingly directed towards building a federal state of Europe.
The absence of any respect for democracy by the EU as an institution was shown during the Brexit campaign. Jean-Claude Juncker, the President of the European Commission, threatened the UK if it dared to leave, saying it would face "consequences", and will not "be welcomed with open arms", and that Brexit would not be "an amicable divorce".
How would Kiwis feel, I wonder, if some unelected bureaucrat was to threaten them in this way? How would they feel if they signed up for a trade deal, but found themselves part of an institution that was merging them into a federal state?
The International Monetary Fund, the UK Treasury and a host of other institutions predicted economic Armageddon if the nation voted to leave the EU. These same institutions also said that not adopting the euro would be a catastrophe. Of course, when the UK Chancellor of the Exchequer is predicting economic chaos in the event of a "leave" vote, it is fairly obvious this will be a self-fulfilling prophecy. The pound has been volatile. This appears to be driven by party political crises as much as any fundamentals of the economic position of the UK.
Despite the warnings of economic isolation, several countries are already signalling a desire to commence trade negotiations. The big question is how the EU will proceed in negotiations. There has been talk of a punitive approach to the UK to discourage other countries from considering an exit. What kind of institution might need such an implicit threat to retain its members?
Perhaps the most worrying aspect of the Brexit vote has been an insidious attempt by much of the media to portray those who voted to leave as xenophobic or racist. Undoubtedly, there was a small minority of voters who held such views, but the attempt to tar anyone in favour of Brexit with a racist brush was the most disgraceful component of much of the media coverage.
Legitimate concerns about immigration became conflated with racism. The UK is a country with an extremely high population density and a net migration level of around 300,000 people per annum.
To put that in context, Britain's second largest city, Birmingham, has a population of around one million people. Current levels of immigration mean the UK needs to build the equivalent of its second largest city every three-and-half years.
I know of many people who have hidden their support for Brexit, afraid to express their views for fear of the torrent of abuse they will receive.
When people are made to feel ashamed or afraid to express perfectly legitimate views, something is going very, very wrong in a democratic system.