I think zdragnar's position is that there can multiple reasons for someone to change their position; two being "genuinely changing their mind" (making them "thoughtful"), and "someone merely switching to a now-popular position" (making them "someone who lacks conviction and unreliable").
Your view seems to be the inner state doesn't matter - they still represent the will of the people they represent.
morkalork's position seems to be that if someone lacks conviction and is unreliable then a problem may be they get elected then switch to represent the interests of a donor more than the electors.
