We've already had prototypical trigger warnings in that shows with flashing lights carry epilepsy warnings. We accept that certain things can trigger nasty responses in people, therefore it's better to add a brief disclaimer so that people with said issues can avoid it.

That said, in any sort of discussion people usually preface links to videos with violent and disturbing content with some sort of warning. If I for example, decided to drop a video of something gruesome without context I would rightfully be lambasted for doing so.

Also, your attempt at downplaying the seriousness of PTSD is really not needed. You're essentially saying that anything can cause PTSD, therefore PTSD is worthless to worry about.