Final answer:
The nurse should respond empathetically to the Vietnam veteran, normalizing his experiences with PTSD and reducing feelings of shame by informing him that many individuals in similar situations face comparable emotions and behaviors.
Step-by-step explanation:
The nurse's best response to the Vietnam veteran suffering from symptoms of PTSD and expressing feelings of shame and helplessness would be to offer validation and support. The appropriate nursing communication should focus on empathizing with the patient's suffering and reinforcing their resilience and capability for change. Hence, the most therapeutic response would be: "Many people who've been in your situation experience similar emotions and behaviors." This statement acknowledges the veteran's feelings while also normalizing his experiences, which can help to reduce feelings of isolation and shame.