If we look at the rest of leave and exclude the anti immigration imbeciles there are the identity voters the "British is best" mob. Why leaving the EU makes the UK any more (or less) British or any better or worse is unclear. I think we can discount these people as stupid as well.
Then we have the gullible that wanted more money for the NHS or have an incorrect understanding of the costs (financial) of EU membership. Many of these also vote Tory and as such I will add them to the idiot collection.
The only other group I can see are the "Lexiters" including Corbyn. These have the bonkers idea that if we leave the EU we can build some sort of leftish society of equality and fairness with increased state ownership of industry and in particular the utilities. This displays a position of ignorance and (dare I say it) stupidity. A quick trip to France (it isn't far) will show that state ownership is perfectly compatible with EU membership. fairness and equality are not under EU jurisdiction but a function of national government.
So basically if people had thought about it for more than a few seconds and had the wit not to be taken in by the lies there really was little in the way of a movement or reason to leave. Humans - all of us - can be stupid at times. However to continuously be stupid in the face of knowledge and evidence is to really confirm that stupidity is the person's default position. I have made stupid mistakes in my life I am sure everyone reading this has too. However I like to think I learned something from those mistakes and will act with more wisdom in future. Age brings experience and (having made more mistakes) hopefully a better judgement. It is doubly sad that the majority of older people have proven through this matter that they have lived their lives without learning anything, without growing up and developing a more rounded and mature view of life and the world. They are just stupid old people.
In five weeks time we will see the results of this folly. It is not too late to change our mind but possibly too late to persuade the repugnant May that it is her duty to allow the UK to do so. Her motivations, I can assure you, are not stupidity. Her motivations will be all too clear very soon. The results will not be pleasant.