Comment by CRConrad

> I am puzzled how it is OK to kill people of other countries, but not your own.

The former is rather universally regarded as regrettable, but sometims necessary: It's called "war". The latter, pretty much never.

Also, there are separate terms for slaying members of your own family, presumably because patri-, matri-, fratri- and infanticide are seen as even more egregious than "regular" homicide. Same concept, only expanded from person to populations -- from people to peoples -- seems to pretty much demand that killing your own population is seen as "less OK" than others.