[defrost]

In general (there are exceptions) most adhere to the broader set of consequentialism of which utilitarianism is one form of.

A number would say that ethics and morality are subjective and not objective and thus an attempt to apply a utilitarian metric or measure of "good" along with a (partial?) ordering such as "greatest good" is a doomed endeavour.

Few would deny that from this, that would follow (for some specific values of this 'n that).

[hilbert42]

I'd essentially agree with that summary.