Everything I have read and learned in taking psychology classes in college indicates not everyone exposed to trauma develops PTSD. It takes everyone a bit of time to recover from trauma and they will have anxiety, trouble sleeping, feel depressed and what not for a time think its called acute stress syndrome or something but its not a disorder...It becomes PTSD when none of that wears off and you keep feeling worse, not better. Also there where many people exposed to the trauma that caused my PTSD and even some kids who where in the classroom where things really got grapic and there wasn't just the fear of getting shot....didn't develop PTSD so obviously not everyone exposed to trauma develops it, having a good support network is said to decrease the likelihood of a person developing PTSD I did not have that.

Also the brain and bones are very different things, I doubt the brain can be fixed just like a broken bone....if anything broken bones are much simpler to deal with. Also though not all broke bones heal right and people who have them will still have significant pain in that area....but that doesn't happen to everyone who breaks a bone. Not everyone develops PTSD that doesn't mean trauma doesn't effect everyone who experiences it and isn't painful, However I saw people able to go on with their lives and even try to find the light in the terrible thing that caused my PTSD of course it will remain in their memory and what not but no, it did not screw them up the way it did me though I doubt i am the only one who developed it but plenty did not but that doesn't mean they where less traumatized than me or 'didn't have it as bad'..., it screwed me up, and I couldn't even complete college because of it.