2 Kings 24:3-4. Speaking about the punishment of Judah under Jehoiakim, the author writes "Surely this came upon Judah at the command of the Lord, to remove them out of his sight, for the sins of Manasseh ... and also for the innocent blood that he had shed; for he filled Jerusalem with innocent blood, and the Lord would not pardon."

Manasseh had been a horrible king and he led the people very far astray. His apostasy was a big part of Judah's doom, but that doom took a while in coming, in order to give the people time to repent. Between Manassa and Jehoiakim there were three other kings, and among those kings was one, Josiah, who tried to turn the people back to God. But the damage done by Manasseh was too great, the people had gone too far astray to be saved by one good king, and so God allowed the destruction of Judah after Jehoiakim's reign.

God sees injustice, he sees wrongdoing, he sees everything, always. Manasseh lived and died and, though he did much evil in God's eyes, you would not know it from looking at his life and death, at least as described in the Bible. Upon his death he just became a part of history to the rest of the world, but not to God. Manassa had his own personal judgment upon his death, which of course we do not know the outcome of, but the people who had been led astray also had a judgment coming. They had free will, they knew what was right, even if their king and everyone else was doing wrong. Many died in between the reign of Manassa and the fall of Jerusalem, and they too would have had their own personal judgment. I am sure many stayed faithful to God and God saw that too, but the majority of the people had let themselves go so far astray that even Josiah's goodness couldn't bring them back. So the societal collapse and punishment had to come, it was the only way to bring the people back - they had to hit rock bottom. But God gave them time to repent, and he gave them a king to help them do so.

God always gives us time and the people we need to help us get there. It is up to us to take advantage of them. If we refuse and continue our turning away, clinging to our sin, we will eventually suffer greatly for it. And surely this will come upon us for the sins of our past that we refuse to turn away from.