Re. emotions:
the government hadn't appeared to listenPeople felt that they were being micromanaged
They also felt that the country's infrastructure was breaking down
They felt too that their national identity was being eroded
They didn't feel that their concerns were being taken seriously
So finally they lost patience and walked.
One could also ask in another way: Did the people do it's job to investigate what the EU was and what the benefits of being a member of the EU is?