Depends on your context I guess. My only experience with this kind of wrecking in the name of purity has come from liberals believe it or not who think we can't continue to function until we have fixed some internal problem with respect to demographics or whatever. The left part of the org fails to recognise this as opportunistic wrecking because they haven't fleshed out their politics and are operating off their own activist common sense and take the bait. In trying to unify with these people and keep them happy, a wedge was deiven through the org and it was paralysed. So I guess sometimes it's not either too much unity or too hardline but both really. As an ML I'd identify the problem as a lack of Marxist analysis and unity in the leadership.