The institutional backgrounds of people can cause them to end up living on the streets (Shelter). In particular, people who served in the armed forces and participated in war conflicts can suffer from post-traumatic stress disorder, which can prevent them from fitting into normal life, living with their families, and so on. As a result, they are at risk of not being able to get along with the peaceful environment around them, and end up on the streets. Another group of people who can potentially become homeless are former prisoners. A prisoner does not necessarily remain a villain after getting out of jail; moreover, such people could have committed some minor crimes, or even were unjustly convicted. Still, non-criminal citizens usually do not give them a second chance, so they often become homeless as well.