Sorry Dame, I meant to reply last night 
I get that you are trying to differentiate between their motivation for rebelling but I don’t think we can say, it’s okay to rebel if I agree with you and wrong to rebel if I disagree.
Carnelian suggested that Field was in the wrong party because
“parties exist so that like minded people gather and vote like-mindedly for the same broad objective because they support more or less the same principles.”
By that definition, Jeremy Corbyn was obviously well out of step with the Labour Party when he voted against the Whip a massive 617 times, and 428 of those rebellions were when his own party was in government. Seems to me that JC was the one who was in the wrong party.
Do I think JC is anti Semite? No and, I know he wasn’t apologising for remarks he made, but as leader of the party, it’s his responsibility to ensure that those who are accused of anti semitism are dealt with accordingly and swiftly.
Ken Livingstone was suspended for two years with no conclusion to the allegations of anti semitism and in the end, he resigned - so the investigation was scrapped. It’s that lack of action that adds fuel to the fire, imo.
As for Boris, the buffoon. I do blame TM for not being much stronger and putting him back in his box! 
Minding awaits 