these reactions in their bodies that are like they're back there in that situation, and they don't necessarily put that together that that's what the happening. [ sirens ] much of the violence is driven by untreated trauma. two of the ways that people often deal with that are to use substances. to manage their emotions, and to carry weapons's in order to feel safe. both of those things are going to increase the risk for them being harmed again or for them doing harm to somebody else. >> that's it. we're home. >> there are organizations trying to help traumatized families and communities in chicago, but the sheer number of people needing help is staggering. >> i've been with chicago survivors since november 2015 and since then