This whit the trauma was meant like : in the 1930/1940thes, lots of people in Europe heard German because Squats from the SS and the Wehrmacht ocupied big parts of Europe because a Austrian Guy whit just one Egg and one mustache..
They shout orders in German, so lots of the older people will be traumatized if they hear German..
You know „Eva!! “ “Mein Leben” !!
So what? The trauma is because what they did to them, not because of the language used doing it. I've never heard a survivor saying "oh, if they would only have raided us in good old Latin! that'd've been much better!".
Traumatised people can be triggered by language, as they could by color, clothing style or anything, but that's not a real cause for other people to avoid those triggers.
They could also be traumatised by the victims language (Hebrew ? Polish ?, excuse my ignorance), because it just brings memory of the disaster.
Besides, there are lots of more recent victims of English speaking troops than of German speaking troops (as far as I know).
Lots of people around the world could be traumatised by English, Spanish, Chinese, Japanese, Arabian. Bantu, Hindi, Russian... It's very hard to think of one language that has never had enough violence expressed through it to cause trauma.
In fact I can only think of Occitan (which can cause trauma too, because it was on the receiving end of the Simon de Montfort cleansing and invasion in the thirteenth century). But I'm sure it is just because I'm uninformed
of history (I've heard Bordèu was involved in slave trade, but I'm not sure what language was spoken, maybe French, maybe Gascon). It's all possibly irrelevant as too old and no witnesses alive, but again what do I know.
Mmm... or maybe Esperanto or Lojban have never had any army using them and are safer in this regard ?
I don't mean to relativise or minimise the Holocaust in any way at all. I just want to plead that it bears no relation to language. Even if the criminals themselves might have said it was about language (inter alia), it was just another lie.
I'm sure the traumas you claim are real, but they're still no reason to choose a language.
Yet you don't need a reason to choose a language, you're welcome to use or avoid German for any reason or none at all, and I may be overdoing it, so I'll leave it at this.