So many different views.....truth be told we all don't live the same life. If you were to ask everybody in the world what life is you would get similar answers, but they wont be the exact same answers. Same with good and bad. The reason why it can't be defined exactly the same is because there's so many different views.
An example would be murder. Majority can agree on it being very horrible and taboo. Yet, the different types of reasons for murder (self defense, accidental, that person murdered another human being, etc.) would make people rethink whether it was bad in that situation or reasonable.
Hopefully that's a decent example that I posted, because I usually have trouble explaining why my comment(s) are what they are.
Yes you do make an interesting point. As i said, not everything is here or there. It's all perception at the end of the day.