According to the author of the book, God sees when people who don't have much or feel sad are being treated badly, and He promises to help them. God says He will stand up to protect them from those who want to harm them.
Psalms 12:5: For the oppression of the poor, for the sighing of the needy, now will I arise, saith the LORD; I will set [him] in safety [from him that] puffeth at him. [puffeth...: or, would ensnare him]
The contradiction or conflict in Psalms 12:5 could be seen in the difference between the promise of divine intervention for the oppressed and the perceived ongoing suffering and injustice in the world. This may raise questions about why, despite such promises, suffering continues and intervention is not always apparent.