"Light" is used by the apostle John to symbolically represent God and godlilness (1 John 1:5). Sin is represented by the figure "darkness" in that context. John states, "God is light and in Him is no darkness at all." Darkness is literally the absence of light. Where there is light darkness cannot abide. Just so, sin cannot abide the light of godliness. Godliness exposes sin to be sin. Godliness is such a contrast to sinfulness that it is like a brilliant spot light being turned on in a dark room. The darkness flees. Darkness can only prevail by expelling all light.
Isaiah 5:20 decsribes a nation where the darkness of evil became victorious, a nation in which evil became so totally victorious that it was pronounced as being good. Good was seen as being evil. Such a scenario means total victory for evil. It is a situation where things are turned absolutely on their heads, everything is upside down!
But the tragic truth is that people in that kind of situation often do not recognize what has taken place. Everything looks normal to them. They do not see things as being out of kilter. They have so totally accepted the abnormal, the subnormal, that it looks normal to them.
Our nation is coming to pretty well fit Isaiah's description of things. Increasingly our society is accepting the message they are steadily being told - that evil is good, and good is evil! Any who call attention to wrong are shouted into submission, their voices are silenced. Standing firm on righteous principles is portrayed as extreme, even eccentric. And most of the righteous among us seem to contribute to the problem by simply saying nothing in opposition to what is happening. We sit on the sidelines watching, but doing nothing to stop the digression. When we believe we can do nothing to stop what is happening, we've already given up, and we've already been beaten by our sworn enemy, the devil. Pray God it will not be so in our land. Pray God that we wake up and speak up before what the prophet wrote of Israel becomes our reality...