I must not have typed it correctly. I'll try again.
RIGHT and WRONG are decided SOLELY by the GROUP.
In alien societies on some far off world, it might be perfectly RIGHT to kill and eat anyone over 30 years old, due to massive overcrowding of their home world.
The GROUP might have decided it was RIGHT, because sickness/disease and aggressive competition for resources had become a problem.
I'm sure that there might be a few 31 year old alien dudes that disagree, but since they are such a minor part of the population, their opinion doesn't matter.
Booooo yawwwwww......
(edited to add) Just like on Earth, if we think that this alien society has it all WRONG (by OUR definition) then we may go and conquer them by force (pointing guns at their heads.. YIPPEEE!!!!

) and forcibly change their society. Sounds good to me. And if they don't want to assimilate? Well... More guns, pleez.
(Gawd i love debating with you, cheffjeff. You have such a liberal, unworkable view of what society should be.)
Russ