No personal agenda obviously 'another of the things you've said on which you couldn't deliver'.
I suggested originally that a case can be made for these MP's to stand again.
This also seems to be what MacDonnell is saying.
I believe it is because in the case of those MP's things have changed in a sense that is likely to be fundamental to many in their constituencies, that they are no longer Labour Party MP's. I would imagine technically, and in terms of precedent, they are entitled to stay on in a different guise until the next general election.
However I think that in terms of my understanding of the kind of contract a MP has with their voters, that contract has been varied to the point that morally if you like, a by-election is the right thing to do.
Some of those MP's call for a peoples vote, or new brexit referendum now that the landscape seems to have changed, so in terms of being hypocritical in their stance (if they don't trigger a by-election) the landscape in their own constituencies has changed, and by their own argument, another constituency vote would be appropriate.
Now I sense you have a generally high and mighty attitude, perhaps only towards me, and the case I set out above might not seem mighty enough to you, or at high enough levels of thinking to be considered in your wonderland of 'delivery', but it is, as they say, what it is.