I'm not sure how the 3 points you mentioned could have not ended like this. For example, for point 2, what do you expect? That somehow EU states will provide t

I'm not sure how the 3 points you mentioned could have not ended like this. For example, for point 2, what do you expect? That somehow EU states will provide to UK all the advantages of being in the union even if it is a bad strategy for them while at the same time UK does not give them any advantages? The Brexit took a really long time to be installed. There were TONS of people telling "ok, the previous one is an idiot, put me in charge and I will reach the greatest deal ever", then failing and being replaced by someone saying the same. And a lot of these people were actively pro-brexit from the start, so it's hard to believe they fudged it on purpose. Also, what would be the point? They are also living in UK, and they are politician here. Surely, it is in their interest to get a strong country and be seen as a hero rather than as an incompetent. A more realistic hypothesis is simply that it is just impossible to reach a perfect situation where you have the cake and eat it.