"'they have become rich and powerful and have grown fat and sleek. Their evil deeds have no limit; they do not seek justice. They do not promote the case of the fatherless; they do not defend the just cause of the poor.'" NIV translation
The people of Judah and Jerusalem were blessed with wealth but did not take care of the poor and the orphans. The depth of our love for God is demonstrated in our treatment of people such as this.
"'Should I not punish them for this?' declares the Lord. 'Should I not avenge myself on such a nation as this?'" NIV translation
God has presented His case against Judah and asks if He is not right in bringing the coming judgment.
The answer would have been obvious to the people as they knew that every charge that was presented was true.
"'A horrible and shocking thing has happened in the land: The prophets prophesy lies, the priests rule by their own authority, and my people love it this way. But what will you do in the end?'" NIV translation
As we see, God is just in bringing the judgment on all of the people as they were all guilty. The so-called leaders and prophets were making up things and telling the people what they wanted to hear. This sounds like the same type of thing that is happening today and it is going to get even worse as the Day of the Lord approaches. Jesus answered the question of what will happen to these people when He said: "I never knew you. Away from me, you evildoers!" (see Matthew 7:22 & 23).