If the moon is made of green cheese, then the moon is edible. The moon is not edible. Therefore, the moon is not made of green cheese. The environment is important. Therefore, everyone should recycle.
Different societies have different beliefs about right and wrong.
If different societies have different beliefs about right and wrong, then what is wrong in one society may not be wrong in another. Therefore, what is wrong in one society may not be wrong in another. If Clinton had an affair with Jennifer Flowers, then Clinton is a liar. Clinton did not have an affair with Jennifer Flowers. Therefore, Clinton is not a liar.