I feel that the growth of Fascist sentiment worldwide can't possibly be a coincidence. Globalisation and it's benefits are being questioned.
People are disappointed. Even this vote , is actually a vote of dissatisfaction against the status quo. They just managed to direct enough of that anger against the EU.
I'd like to suggest the following three hypotheses and hear what you guys think :
1. As growth slows , liberal democracy ceases to be the status quo. It's much easier for a demagogue to whip up sentiments against the "other" when people feel that they have been left behind.
2. The media has always been a gatekeeper and helped keep the more extreme voices out of mainstream discourse. The internet breaks this dynamic and now disaffected majorities can coalesce across regional boundaries within a country.
3. The Western working class has realised that globalisation doesn't seem to be raising everyone's living standards. It's more of an equalisation where large numbers of people in Asia are lifted into the middle class while the western working class stagnates.
This diagram shows a clear class divide in the voting:
http://i.imgur.com/SneDXWa.png
I don't have much more data to back these up so I'd be interested hearing any thoughts / anecdotes about such things around where you live.