It would be fanciful to liken the ascent of Boris Johnson to the outbreak of global war, but similar forces are in play. There is room for debate about whether he is a scoundrel or mere rogue, but not much about his moral bankruptcy, rooted in a contempt for truth. Nonetheless, even before the Conservative national membership cheers him in as our prime minister denied the option of Nigel Farage, whom some polls suggest they would prefer Tory MPs have thronged to do just that.
I have known Johnson since the 1980s, when I edited the Daily Telegraph and he was our flamboyant Brussels correspondent. I have argued for a decade that, while he is a brilliant entertainer who made a popular maître d for London as its mayor, he is unfit for national office, because it seems he cares for no interest save his own fame and gratification.
...
Like many showy personalities, he is of weak character. I recently suggested to a radio audience that he supposes himself to be Winston Churchill, while in reality being closer to Alan Partridge. Churchill, for all his wit, was a profoundly serious human being. Far from perceiving anything glorious about standing alone in 1940, he knew that all difficult issues must be addressed with allies and partners.
...
Johnson would not recognise truth, whether about his private or political life, if confronted by it in an identity parade. In a commonplace book the other day, I came across an observation made in 1750 by a contemporary savant, Bishop Berkeley: It is impossible that a man who is false to his friends and neighbours should be true to the public. Almost the only people who think Johnson a nice guy are those who do not know him.
https://www.theguardian.com/commentisfree/2019/jun/24/boris-johnson-prime-minister-tory-party-britain
You don't get much more mainstream Tory than Max Hastings.