Do Kassadin and the other 'Preservers' have PTSD(Joke Idea for Kassadin)?

As you may know, Kassadin is one of the Preservers. In case you are wondering, Preservers have seen what will happen to the world if the Voidborn invade Runeterra, and have been moven by the horrors to the point where they would sacrafice themselves to delay the oncoming invasion. But, if you think about it, it kinda sounds like PTSD, where the horrors that the afflicted have seen/experienced cause them to do irrational things. Personally, I think Kassadin should have a new joke added to his dialouge, something around the lines of, "I've seen some stuff, man". I think it would be a nice addition to his dialouge.

P.S: Speaking of Kassadin and Jokes, his joke is kind of irrelevant now, as he no longer silences(His old joke was 'I tried to silence my mother once. Boy, did I regret that').