The problem is that leavers have no understanding of or interest in detail. Their world is one of black and white absolutes, where you only need to change one thing for the better, to change everything for the better.
Take EU immigration for example. Belguim deports anyone who does not find a job within three months and it is perfectly within EU rules to do so. But how many leaves voters even know that.
What has happened is that free marketeers like Farage, who want an end to regulation so that the barons can make even more money at the cost of the rest of us, have turned the EU into the bogeyman, the source of all woes, when in fact, it is our own successive governments that have created the economy we live within.
The naivety of it all is truly astounding, perfectly illustrated here.