1/ Brexit politics is built on fear. Frightened people tend to seek security in the tribe. Once that tribe might have been the Labour movement, but now in a fragmented post-industrial society it is the nation. Tribal identification is emotional, not rational. 
2/ A tribe that feels under threat wants to control its borders, and who enters into its territory. It demands loyalty and solidarity, and its prime virtue is self-sacrifice - economic arguments won't persuade tribalists. Its members want to feel it is strong and powerful.
3/ Tribalism at a time of crisis is intolerant of dissent. The tribe must pull together against its enemies. Dissent and questioning cause division and disrupt the collective effort. Criticism is seen as treason. The Brexit right have ruthlessly exploited tribal psychology.
4/ To understand Brexit politics it is necessary to understand that the working and middle classes are dead as coherent political forces and that frightened and insecure people are now clinging to the only available powerful tribe, the nation-tribe.
5/ The Brexit right understands and ruthlessly exploits basic social emotions. In contrast the centre and centre-left mostly can see no further than the blinkered logic of rational individualism, from which perspective everything else is irrational and incomprehensible.
6/ Tribal psychology is only irrational from the standpoint of rational individualism. It was highly adaptive for our ancestors, and without it we almost certainly wouldn't exist. Unfortunately in the modern world it's very easily exploited by ruthless political factions.
7/ Most of those who adhere to the nation-tribe do so because they want it to make them feel safe and secure. So they want to be told that the tribe is powerful and successful, hence the cynical and manipulative outpouring of rhetoric about Britain being 'world-beating'.
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