... und natürlich ist die Regierung Netanyahu "rechtsextrem". Die Autorin fragt nicht ein einziges Mal nach der Verantwortung der Palis und ihrer Hamas. Aber natürlich sind die Palis jetzt alle "traumatisert"? Und die Israelis nicht? Egal, hauptsache, man kann Israel wieder eins reinkübeln.
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Thank you. In public and political language, "aussondern" stems from German psychiatry after WWI, describing the separation of the mentally ill, who in 1940 in Operation T4 were the first to be euthanized in driving closed vans w/ Carbon monoxide. The first experiments in mass gasification.

"Sunder" means "separating" too, both perhaps deriving from the Anglo-Saxon "sundor" (apart, for itself), later in English "asunder" (broken, apart).

(It was this last aspect that made me react to your original post re: "great word". It made me shiver. But I deleted my former reply.)

The prep. is from the 14th century, the verb "sondern" (setting apart) as the substantive form "Sonderling" (excentric, someone strange & a bit weird) are from the 16th century. www.dwds.de/wb/Sonderlin...
Note that "aussondern" was the term used to describe the selections at the ramps of Auschwitz.

The etymology of the German word says otherwise. Anyway, when used as a borrowed word into English, one can attach pretty much any meaning one wants it to have.