>If you can’t choose what morality to believe in, it’s no use trying to convince someone to follow your morality.

does anyone 'choose' which moral theory to follow?

i would argue the one you pick is merely the one that you feel is best ie you wont be convinced by a rational argument since you never reasoned yourself into your belief in the first place.

logic works from emotion ie if you think utilitarianism is best its because you feel its best, reasoning and logic happen after the fact.

i never reasoned myself into my morals, i pick and choose based on context and use my emotions to guide my reasoning (you cannot determine which is 'better' without use of emotion)