I do not think how we got here was very complicated.
The UK is an old country with a lot domestic issues and long term ones at that. These are very difficult to manage.
There is in politics something very attractive in such a situation who says they have simple answers. You abdicate your responsibility on to them, you listen to their simple answers and you believe them. History is littered with elections and politicians like this, and usually it does not matter because simplicity is the cover for someone who is very cognizant of the real challenges that exist.
What happened in the UK is that for the first time that the Conservatives did not know. They decided that they would choose a leader over a set of actual objectives. This was very successful in the sense they won, but with s group of people who were the absolute z list of their party who were really committed to Brexit. Johnson is a great campaigner but he is an empty vessel. Our politics is now empty and devoid of any purpose connected to the people who vote. The UK needs hope and a purpose.
Or it will descend into poverty, rancour, racism and corruption. It is not written in the stars we decline, but we definitely can if we don't have a vision of what it should be like to be in the UK and how people are treated.