Guess I still dislike utilitarism

Because it makes super easy for power abusers to rationalize their way into effectively annihilating/abandoning/not caring about individuals and groups they consider 'not useful'. Yes, 'real' rationalists supposed to know this is big Error - but when such thing as unenforceable logic error stopped any of such people? And twisting moral rules into whatever mess serves them is way too well known game to ignore ....