OK, the word "tragedy" is best reserved for things like accidents with multiple victims or young victims (the Titanic was a "tragedy"); weather-related deaths like tornadoes. The very definition of "tragic" is linked to "disaster" and words like "sad" are assigned within the definition of "tragedy."
It's not that this description is totally off base, it just that it deliberately steers clear of the social justice indignation that such a massacre would otherwise vividly highlight, and implies that there were only "victims" and no "perpetrators"--at least none with malicious intent.
In the same way, abortion is not simply a tragedy, but stark murder; and a murder of conpsiracy at that. This, too, was a mass murder involving conspiracy.
This would certainly be a surprise to Aeschylus, Sophocles, Euripides, and Shakespeare, among others.