The first is that Brexit demands closed thinking. The campaign was built on a lie that Brexit would save the UK money and release funds for the NHS. No one now pretends that is true. But the consequence is that those promoting Brexit now have, perforce, to close their ears to rational debate because they are all too well aware that what they are now doing is both irrational and harmful. It is in fact pure fantasy.
There is a time and place for fantasy; the hard politics of international relations is not one of them and yet most of the current narratives the UK is pursuing fit this description.
The UK leaving the EU is a disaster
So there are at least three lies. It would be easy to note more: that Scotland has no chance of making it alone is another tht is regularly repeated to sustain a Unionist myth.
Scotland leaving the EU and the UK would be just fine.