You need to portray the condition delicately and carefully. It's difficult to avoid anybody raising issue about it, but if it's tastefully done, I think it's okay. Many movies and novels do use PTSD as a central theme or even just a character modifier. The condition is a fact of life and it doesn't really go away if people tiptoed around it. It's just up to you to give it a fair or even legitimate showing.
However, it would be useful to get a moderator's point of view about it.
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