So, what do you do if you start from the same premises but then diverge? Is there an "objective" way to figure out who is right in absence of some mathematical theory of morality?
If we start with the same premises, we should reach the same conclusions, if I'm interpreting your question correctly. It may help to provide a concrete example of disagreement.
As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.