For most Conservatives, Boris isn't their type of Tory.
They don't like him.
But he was a Brexiter and a populist and their route to them getting Brexit (no 1) and staying in power (no 2). Nothing else mattered.
They knew he was a liar, corrupt, lazy and incompetent. They don't mind the corruption and the lies as long as it is not targeted at them, they are par for the course. The sin is getting caught out. They don't like lazy and incompetent though. Still, it was all a package and a price worth paying for them because all they ever look at is themselves and the short term. The long term damage to the country doesn't matter. They don't realise it matters because they are insulated by their wealth and their distance from those who are impacted. They don't have to confront it day to day so they don't realise it is a problem. Those who complain are just whingers doing it for political reasons because they want more handouts instead of getting off their backsides and doing something about it themselves. That is what they think they did. It was all them. No privilege involved, no head start in life, no benefits from who you or your parents know, or old school chums and no benefit at all from a country with an educated, healthy, workforce and a great infrastructure to exploit. No, they did it all themselves with no help anywhere.
Only now, when the damage to reputation and relations starts to actually impact on them, that they are scorned by their international friends, that the Royal family is miffed at being lied to and that they have got so arrogant and greedy they let the general public see behind the curtain and is now outraged, only now are they prepared to take steps to rid themselves of Johnson who isn't quite 'one of ours' really. Because the actual impact to them could be losing power. Tut tut.