Amos is in no doubt that love is an important attribute of God. We saw that last time and we'll see it later in this passage, but equally important is God's desire for righteousness. You see, the suffering that Amos sees is suffering experienced by the poor and powerless. It's suffering inflicted on them by the rich and powerful. What they call justice would make you sick.
Righteousness is trampled upon.
They hate the one who reproves in the gate, and they abhor the one who speaks the truth. If you wanted justice in Amos' day you went to the elders who sat in the city gate and presented your case to them. If one of the elders gives a judgement that reproves a wrongdoer, he gets frowned upon by his peers, that is by the other rich and powerful elders. If someone speaks the truth he earns their hatred. They justify their oppression of the poor by levying taxes of grain, so it sounds above board.