You can't "get behind" something that was bought with a dud cheque like Brexit. This is why it's so poisonous. It was not "the will of the people". It was the will of some people amplified by outright lies through a media machine awash with foreign money. All of which has been proven. It is an irritating feature of facts us they remain true even when you ignore them,
Even if it was the will of the people at the time, people are allowed to change their minds.
Worth remembering that the Tory was not and has never been "the Brexit party".
One thing that is totally true is that all have to accept the damage it has done - and I have certainly accepted that. But that's all the more reason to fix it.