‘Therefore thus says the Lord Yahweh to them, “Behold I, even I, will judge between the fat cattle and the lean cattle, because you thrust with side and with shoulder, and push all the diseased with your horns, until you have scattered them abroad.”
The leaders and the wealthy were like the fat cattle that made use of their strength and bulk and thrust and push until the weak moved away and were scattered. They did not care about those for whom they were responsible, especially the sickly. They wanted to move them out so that there was more for themselves.
So God was making clear His displeasure at the current leadership of Israel, and the well-to-do, because they were like the rams and fat cattle. They had no time for the poor of the flock. And it is clear that He expected things to go on like that as He now revealed. He was under no illusion about the hearts of His so-called people. Indeed he recognised that there was only one hope, the raising of a man, a chosen man, a unique man, at His behest, to bring about His will.
There are many Christians today who also behave like this. They push people out of the way. They arrogantly exert their authority over others (often claiming to be humble). They too must recognise that God knows their hearts and will call them to account.