I get your point and I think I mostly agree with it, but from a utilitarian point of view, it's actually not that much of a stretch from 'because people like it' to 'it is okay' ;-)
This fundamental problem of any form of normative ethics is that they are all subjective. If you accept the notion that everyone is entitled to his or her own personal views on ethics and morality, this inevitably means the majority opinion is what ends up as being the accepted morality.
Of course we could argue about whether normative ethics in general, or utilitarian ethics in particular are 'wrong', 'incorrect' or 'unjust', but that even though that could lead to a very interesting discussion, it wouldn't probably get us anywhere. Over two thousand years of thinking before us haven't reached any kind of consensus on this topic ;-)
This fundamental problem of any form of normative ethics is that they are all subjective. If you accept the notion that everyone is entitled to his or her own personal views on ethics and morality, this inevitably means the majority opinion is what ends up as being the accepted morality.
Of course we could argue about whether normative ethics in general, or utilitarian ethics in particular are 'wrong', 'incorrect' or 'unjust', but that even though that could lead to a very interesting discussion, it wouldn't probably get us anywhere. Over two thousand years of thinking before us haven't reached any kind of consensus on this topic ;-)