The EU has constantly underestimated UK unhappiness with the EU and our resolve to leave as a result.
They are in danger of doing so again. They are determined to believe just leaving is impossible, because it does not suit them. No worry that it forces them into their own Project Fear. No worry that it means trying to think of ways to harm themselves.
Leaving without a deal is always going to be better for us than a punishment deal. What is bizarre is the number of politicians in the UK who are on the EUs side,actively promoting the idea that the UK has to pay a fortune to the EU to leave when there is no such legal or moral obligation on us. The BBC also claims to have found government officials who want to undermine the walk away option. So they too want to weaken the very strong UK position.
The EU should not overplay its hand by believing the UK woukd not dare to just leave if there is no deal that makes sense.