So, what makes you good? It's your conscience, if you are good (Not sure you are). Your conscience is the Light of Christ which is in all things to point to what is good or evil. It gives us a good foundation to make judgments that are good. When we continually deny this and God, then that light is dimmed and eventually snuffed out. Sometimes this is called a reprobate mind.
Those with a foundation in Christ can have a firm foundation on the decisions they make in life. You have lost much of this or do not recognize this. Thus, you can sometimes by luck choose good. But, it's only by luck. Not by any conscience desire. Those who are going around saying "gas the Jews" are reprobates with no conscience foundation.