Where it utterly breaks down is in the "Liberty vs Tyranny" or the "Attacker vs Victim" realms.
There, any pretense that one choice is just as valid as the other is simply denial. The denial that the bad guy is bad serves no useful purpose for you. Tyranny, the systematic denial and violation of individual liberty in favor of power for The State, is completely wrong. It has no good side, even if it results in superficially "good" results. Liberty, even if it seems scary and dangerous, is the only ethical choice. Liberty is right, and tyranny is wrong. Completely, and without any equivocation.
If you are being attacked, your attacker is completely wrong (at that moment), while you are in the right if you choose to fight back with all you have. The one who "started it" bears all the blame if he is killed in the ensuing conflict. Yet, if you harm someone else during your defensive actions (perhaps the attacker's family member who wasn't involved), YOU become the attacker, subject to the laws of consequences.
Of course, this evil can be seen with your own eyes rather than being preached by the priests of The State to unquestioning believers who have witnessed nothing but what those priests have chosen to show (or stage) for their own ends. In other words, if someone has to convince you that someone is out to get you, with no evidence that can be seen, you would be better to laugh it off. And, conversely, if you see evil being committed don't buy the justifications that those supporters of the bad guys will try to bury you under.
You are being delusional if you think there is not real right and real wrong. If you are being attacked by a thug who wants to steal your property or rape and kill you, it is insane to think he might have a valid point of view as you stare down the barrel of his gun. He is the bad guy.