According to Amos, God is saying that the people have forgotten how to do good things and instead they gather badness and stealing in their big houses. It means they are not living the way God wants them to.
Amos 3:10: For they know not to do right, saith the LORD, who store up violence and robbery in their palaces. [robbery: or, spoil]
The contradiction or conflict in Amos 3:10 could arise from the behavior it describes, where people are doing wrong and violence but are unaware or indifferent to it. This poses a conflict with the idea of moral awareness and accountability, suggesting a disconnect between actions and ethical understanding.