A leader who, rather than representing the will of their people to the best of their ability, instead actively operates against said will and in their own interests [and in the interests of foreign powers], is not a leader but a traitor.
But my question is why isn't Boris Johnson the PM?
And just so you know I believe that Brexit is good, that national sovereignty is good and the smaller the political unit the more successful it is. I think hard Brexit is better than no Brexit. And maybe the EU is so stubborn that the only negotiating tactic is hard Brexit, then come back later for a trade deal. But that doesn't excuse the political leadership from shirking their responsibilities.