“…First, with welldesigned true experiments, exposure to weapons alone has been shown to cause an increased propensity for the observer to behave aggressively in the short run, albeit without weapons (Berkowitz & LePage, 1967; see also Anderson, Benjamin, & Bartholow, 1998;Ariel et al, 2019). Second, there are a number of well-done empirical studies that have shown that a youth's exposure to violence in any of multiple domains increases the risk for concurrent and later violent behavior by that youth, sometimes with weapons (Boxer et al, 2013;Dubow, et al, 2019). For example, youth exposed to ethno-political violence are more likely to behave aggressively against their peers (Ibid); exposure to family violence increases the risk of violence in children from that family (e.g., Boxer, Gullan, et al, 2009;Dodge et al, 1990); having violent peers increases the risk of a youth behaving violently (e.g., Espelage et al, 2003;Tolan, Gorman-Smith, & Henry, 2003); having violence in the neighborhood increases the risk of youth growing up in that neighborhood behaving violently concurrently and later (Guerra et al, 2003;Schwartz & Proctor, 2000); and exposure to various forms of media violence increases the likelihood of youth behaving violently later in life (sometimes with weapons; Anderson et al, 2007;Eron et al, 1972;Huesmann et al, 2003;Huesmann, 1986).…”