Some people say use of condoms in marriage is evil, others not. Both sides can argue a rational case yet they disagree.
Some people say cheeseburgers are evil (unhealthy, involve breeding and killing animals on an industrial scale, etc.). Again, they can argue a rational case yet others disagree.
Some people say dancing is immoral, I’ve seen some on CAF say all pop music is evil, even once (not on CAF) that saxophones are evil, the rationality having something with the seductive quality of music.
In each case one group is not just making a moral judgment but is bringing something into the moral domain which others don’t even see as a moral question. We could do this with just about anything – red lights are immoral because they stop traffic and are associated with red-light districts.
Morality
is bound up with feelings and beliefs, and what’s moral to one group may not be to another, even though each group thinks it’s right and the other wrong. Maybe there just might be a correct answer to every possible moral question, maybe saxophones are indeed universally evil for all time, but if no one can know what’s the correct answer objectivity doesn’t have any meaning, it’s angels on a pinhead, indistinguishable from subjective.