I'm very tempted to suggest that, as with antibiotics, you try to acquaint yourself with what a donkey jacket actually is. The article you link to, a reasonable precis of Foot's career, sheds no light whatsoever on your donkey jacket assertion. There's also nothing there about what you seem to regard as treachery. The thing is, we live in a democracy. As such, we have every right to challenge the government's stance. No-one on the remain side is holding a gun to anyone else's head. If we wish to campaign until the bitter end for a reversal of brexit, that's us exercising our democratic right. Only neurotic little-Englanders such as your good self see a threat in that.