And after all this time you still won't get it.
Had the EU remained as it was, remained as a trade bloc with co-operation between it's member states, leaving would not have been an issue. But the EU, the administrative EU, the political EU, the ones whom even it's own members cannot abide, were working towards changing what the EU represented, what the EU was, and what it meant to be a member.
It wanted more control it wanted more power, it wanted to be seen as something 'greater' and many became opposed to that view. You say there's "no concrete proof" when you yourself once adhered to the concept in the other thread that "it was well known that the EU was always going to become a political bloc".
You are so blinded by EU loyalty, so indoctrinated, that even you fail to acknowledge the statements made by the likes of Barroso, Von Rompoy, Juncker and recently it's two most leading members national leaders Macron and Merkel, all reciting the same rhetoric. You will never understand why the public of this nation had enough, and that it wasn't a vote to leave the current EU, it was to prevent us being absolved into the future EU that many of us did not want to see, and knew this was our only opportunity of halting it.