The A-portion of Amos 5:15 reads, "Hate the evil, and love the good, and establish judgment in the gate." If something is indeed unjust, unworthy, mean, unfair or wrong, then our response should be MORE than just dissatisfaction. It should be hatred! Bible here instructs us to do THREE things, not just to pick and choose which one(s) of the three we want to do. It is, therefore, critical to our ability to righteously "establish judgment in the gate" that we "hate the evil, and love the good." And in order to fulfill this prerequisite, we must be transformed by the renewing of our minds, as stated in Romans 12:2, so that we can appropriately--and without question--discern evil and good BEFORE we establish judgment.
In considering "the gate," we must understand that it represents an opening--more specifically, a guarded opening. This is why the aforementioned renewing of the mind is so important: it's designed to produce the mental sobriety necessary for us to successfully determine what goes in and out the gates of our lives. Additionally, the phrase to "establish judgment" can be better understood as presenting the verdict. And believe me: when the mind embraces GOD's verdict, the mouth can then articulate it with conviction. But wait... Once pronounced, the verdict still must be enforced; and dissatisfied people DON'T enforce judgments. Only the indignant are angry enough to call for the power of GOD as well as make the Spirit-led decisions that will guard the gate.
When people are desperate for change, they will do whatever it takes to see change happen. Therefore, may your worship welcome an uprising of holy indignation TODAY that will actualize your desire for change by spurring Spirit-led decisions for the power of GOD to back up on your behalf.