In the first place, we do not always have all the facts. Even when we do, when seen in different contexts they can lead to different assessments. And even when two parties agree on both the facts and the judgments, they can still arrive at very different conclusions, as God and Moses did after the Golden Calf incident. This brings to mind the very first teaching of the Oral Tradition. The oldest teaching in the Mishnah is from the Great Assembly.
Human reality is multidimensional, and things are often more complex than they initially appear.
This is especially true when considering a course of action that might be hurtful to others. The story of the Flood has two messages. On one hand, it does not deconstruct ethics. That we are vulnerable to temptation does not blur the line between right and wrong. But it does remind us that in addition to a value system, there are other components in our decision making.