Relativity of ethics
Relativity of ethics is the concept that something that is deemed good might not be good for everyone. Conversely, what is good, should be good for everyone.
The word good is a relative term dependent on its framing. For instance, on the Death Star, Luke and the Rebels went out to blow it up but, what of the imperial officer coming to work to feed his newborn baby? Was Luke doing good when he launched the proton torpedo blowing them all up or was the imperial officer doing bad when coming to work?
The Definition of Good
The only 100% good is what is common for all. In this galaxy, closer, closer... under your feet, we all stand on the earth. We all drink the same water breathe the same air, if someone truly thought their aim was to do good, they would have to be involved in protecting the earth.