There is no good answer to the question of why Rishi Sunak called the general election for 4 July, other than that it comes at a time when things are marginally better than they were and before things could get a lot worse. There is, by the way, no good answer to the question of when would be a good time for the Conservatives to hold the election because they are 21 points behind in the polls and largely hate one another and the responsibility of government.