I have thought about good and bad quite a lot of times in my life. Since there is no universal ethics code, you cannot define pure good and pure bad. But I think that good does exist in those who act guided by love and respect towards themselves and all others.
Even when I reflect upon my deeds, I find bad in some. Do I regret them? Most yes, some I can't no matter how hard I try. There are certain people for example I can't sympathize with, I simply can't because I don't feel they deserve it. I won't wrong them or harm them, but I won't feel sad if anything happens to them, I simply don't care.
Good and bad is a personal option and point of view. And what you said before, if you discover bad in your actions and don't change them. Have you thought the reasons for not changing them? Example: Are you in a job where you do bad things, but if you quit it you'll have no money to feed your children? Then I would say you have almost no choice. But if this jobis not the only option and you keep doing it, then yes, you're not acting guided by good but personal profit.
It's all so relevant...