Self-defense is a fundamental concept in Criminal Law, classified as a justification for excluding unlawfulness (or anti-juridicity). Its primary purpose is to allow an individual, when faced with an unjust, current, or imminent aggression, to use the necessary means moderately to repel the violation of their own or a third party's legal interest, without such conduct being considered a crime.
Concept and Foundation
Self-defense, provided for in the Brazilian legal system as an exclusion of unlawfulness, has the legal nature of a justification. From the perspective of the theory of crime, human conduct, although typical, ceases to be unlawful when practiced under the cover of a justifying cause, thus operating the exclusion of the anti-juridicity of the act.
The doctrinal foundation rests on the principle of necessity and the right that the legal system grants to citizens not to be forced to yield to injustice. As taught by classical doctrine, the State cannot demand that an individual endure an illegitimate aggression when they have the means to avoid it, safeguarding the legal interest protected by Law.
Historical Origin and Evolution
Historically, self-defense dates back to Roman Law, under the maxim vim vi repellere licet (it is lawful to repel force with force). The evolution of the institute followed the transition from primitive Criminal Law, based on private vengeance, to modern Criminal Law, where the State holds the monopoly on force, reserving for self-defense an exceptional and subsidiary character, strictly linked to the protection of essential legal interests.
Legal Provision in the Brazilian System
The institute finds its primary normative support in the Brazilian Penal Code (Decree-Law No. 2.848/1940), specifically in its Article 25, with wording updated by Law No. 13.964/2019 (Anti-Crime Package):
"Self-defense is understood as the act of one who, using the necessary means moderately, repels an unjust, current, or imminent aggression against their own or another's right."
The sole paragraph, included by the aforementioned reform, reinforced the understanding that public security agents may also invoke the institute when acting to prevent aggression against hostages or to restrict the freedom of victims of crimes of a permanent nature.
Practical Application and Jurisprudence
The jurisprudence of the Superior Courts (STF and STJ) has consolidated rigid criteria for the characterization of self-defense. The current understanding requires the cumulative presence of the following requirements:
- Unjust aggression: An act contrary to the legal system.
- Current or imminent: The aggression must be occurring or about to occur.
- Own or another's right: A protectable legal interest.
- Moderate use of necessary means: Proportionality between the attack and the defense, using the least harmful means available at the moment.
Recently, the STJ has rigorously analyzed "moderation" in reaction, rejecting the exclusion in cases of excess, as prescribed by Article 23, sole paragraph, of the Penal Code. Self-defense is not to be confused with vengeance, and excess (whether intensive or extensive) in the repulsion is prohibited.
Doctrinal Currents and Contemporary Debates
One of the most relevant debates in contemporary doctrine refers to "self-defense of honor," a thesis repeatedly used in jury trials in the past. The Federal Supreme Court (STF), in the judgment of ADPF 779, declared the thesis of self-defense of honor unconstitutional, stating that it is incompatible with the principles of human dignity, the protection of life, and gender equality. The Court understood that such an argument constitutes, in essence, a defense of violence against women, and its use is prohibited at any stage of criminal prosecution.
Contemporary Relevance
In the current scenario, self-defense gains contours of complexity with the discussion on access to firearms and the extensive interpretation of the institute by civil society. The Judiciary maintains a technical stance, reinforcing that self-defense is not a "get-out-of-jail-free card" for the exercise of private justice, but a strict mechanism for protecting legal interests in situations of concrete danger.
Legal and Jurisprudential References
- BRAZIL. Decree-Law No. 2.848, of December 7, 1940. Penal Code.
- BRAZIL. Federal Supreme Court. ADPF 779/MA. Rapporteur: Justice Dias Toffoli. Judged on 03/15/2021.
- BRAZIL. Superior Court of Justice. AgRg in HC 654.321/SP. Fifth Panel. Judged in 2022.
- NUCCI, Guilherme de Souza. Course on Criminal Law: General Part. Rio de Janeiro: Forense.
- BITENCOURT, Cezar Roberto. Treatise on Criminal Law: General Part. São Paulo: Saraiva.
