survivor guilt
noun [ U ] psychology specialized uk/səˌvaɪ.və ˈɡɪlt/ us/sɚˌvaɪ.vɚ ˈɡɪlt/ (also survivor's guilt)
幸存者的负疚感
difficult and painful feelings caused by the fact that you are still alive after a situation in which other people died
Part of the problem for war veterans is survivor guilt; you feel like you deserted the guys you left behind. 老兵面临的问题有一部分是幸存负疚：觉得自己抛下了死去的战友。