[simonh]

The opinion that fewer immigrants will mean less crime. That our trade deal in the EU exposes our companies to unfair competition. That fewer immigrants will help preserve 'our' way of life. That we will be free to reach our own trade deals with other countries. Most of Brexit is about forward-looking hopes and expectations. I don't believe it, but it's hard to disprove because what do people even mean by 'our' culture, etc?

[ben_w]

Hmm. I believe the two trade examples are testable (and as claims, the former false and the latter true).

The other two I will grant you, and I thank you for providing them.