The problems with statutes is that they normally fail to have flexibility required for justice until outrages occur that force the legislature to rewrite the laws. The opposite approach is to write vague general statutes and rely on customs, reasoning by analogy using preceding cases, etc. by judges which is what the common law did. Over time,statutes have crowded common law out of the picture in criminal justice.
Law itself is a means to an end which is an approximation of justice accepted by society and keeping the peace among residents by limiting conflict over personal disputes. By its written universal nature, it is designed to be both knowable and allow citizens to conduct themselves in compliance to it. But, the limitation of a written law is that it should serve a valid purpose that does not interfere with individual rights that are protected by the higher laws of the constitutions of states and the national government.
Law is simply a way of resolving disputes so that individuals do not have to resort to self justice which tends to exceed the tolerance of societies (few can reasonably serve as a disinterested judge of their own conduct in their particular case against another). A particular law is not by itself something worthy of worship nor are lawmakers or judges or even the citizens willing laws into existence. Each have been the source of injustices in the past and will do so in the future. Ideally the law and justice should coincide in producing the same result, however, just like statistics, the average application does not mean that facts at either extreme of a cases involving the law does not involve some degree of injustice. Monsters often get less punishment than they have earned by right of their evil deeds and good people often get punishments that they did not deserve.
Justice in this particular case, to me, would dictate not punishing the victim of the assault assuming that the facts of the story are true. If anything, the failure of Chicago to protect its citizens from such actions by violent felons is injustice. Getting hit up the side of the head and a reasonable fearing for one's own life taken by a firearm dwarfs the petty charge of carrying without a concealed carry permit. We cannot forget that Chicago is a city with a corrupt judicial system which fails in its basic job to protect the public except for the connected and wealthy.
However, the problem in American jurisprudence as it has evolved, is that the statutory law does not give the alternative or flexibility to the judge and jury to do justice. Thus, we have the prosecutors making these selective prosecution decisions which vary by jurisdiction and arguably deny equal protection of the laws. Personally, I believe that we may have to go back to the system in the past in some colonies where the jury ultimately determined both law and fact as applied to a specific case. Either that or create separate courts of equity to negate the injustices created by application of the letter of the law by statutes. Too much power is given to individual prosecutors whose decisions are not in an ordinary sense reviewable. I would rather trust the rough justice of a jury in a case or the outside perspective of a court of equity reviewing petitions of injustice than trusting the tender mercies of a prosecutor.
This case is an example of how we end up with more and more laws and less and less justice. The justice of a personal right to self defense against another seeking to rob someone has more or less been universally applied throughout the millennia in various cultures, regimes, etc. Even during the worst periods of Stalin, the courts in Russia recognized the right to self defense of one's life against common criminals. Thus, following Chicago's example in the case, is how more and more criminals who are sympathetic to a significant portion of the population are put into the system and suffer a loss of liberty. The disgusting saga of Chicago's resistance to court orders to implement concealed carry is in of itself a gross miscarriage of justice and the laws fall most heavily on the poor who typically live in the most dangerous neighborhoods
https://www.usacarry.com/chicago-increase-concealed-carry-permits/ and
http://www.chicagogunsmatter.org/concealed-carry/28-concealed-carry-license-q-a. This is also the land of DA Foxx who purposefully interfered with the investigation of a celebrity that was so egregious that the judge in the case ordered a special prosecutor to conduct the investigation.
What most of the posters above are indicating is that justice is not being served putting someone who had to defend their live in extreme circumstances on trial for violating a licensing provision that obviously has been widely ignored by prosecutors when it involves gang members. The law itself was allegedly made for the purpose of protecting society, not the robber, and thus society should have some say in how it is prosecuted. This is not expressing a sense of lawlessness by the posters supporting the crime victim but rather that the facts in this particular case do not warrant prosecution by compounding the suffering of the robbery victim in this particular case.