Men (and women) make plans, some of them very evil. They think they can make great gain for themselves at the expense of others, and that they will get away with it. They make plans and then carry them out.
But they forget the Lord, and there will be a day of reckoning. There will be a day when judgement comes and wrongs are put right. The wicked will be brought low, no longer will they walk proudly. Instead of being feared, or even admired, they will be viewed with scorn and ridicule. The Assyrians would come and divide up the land for themselves. The rich would have no one in the "assembly of the Lord" to speak on their behalf, for they had forsaken the Lord.
The wealthy did not want the Lord's prophets to prophesy. They did not want to hear the truth. So they thought up schemes which denied what the Lord was saying. Today, people produce clever "theologies" to do away with the bits of the Bible that they do not like (its teachings on sexual morality, on hell, on judgement, on the uniqueness of Christ etc), but they are just talking nonsense.
The rich were exploiting the women and children. The rich did not want to hear about righteousness, they want a prophet who spoke about more wine and beer.
But the Lord watches over His people, and He would send a deliverer. V12,13 are a clear reference to the coming of Christ. Jesus makes a way for our salvation.