I think people tend to make their decisions on how things are now rather than the past.
From my POV I made my decision based on my knowledge of economics and history and that what I did at uni.
Personally I think it’s reasonable to object based on the Maastricht, or Lisbon Treaties.
I’ve also always pointed out that voting in was doing so with as much uncertainty as voting out gives as voting in doesnt just mean you’re in acceptance of the EU as it is today, but that EU policy is to continue to evolve into a closer political, social, legal and economic state.
You’ve only got to look at what the EU was 15 years ago. It’s vastly different and despite being ‘at the table’ we were swept along by these changes and could reform them so we’re powerless anyway!
What’s really sad is how politics for the masses has been changed for the worse by the confirmation bias of social media. Those who don’t agree with you are stupid, thick, selfish, uneducated...
This is why Trump and Brexit have been such a surprise!