the place to talk about this is on the massacre talk page but i think you should read the archives to this page very carefully because the problem with the word massacre is exactly the same as with the word wp terrorist a word with intrinsically negative connotations that are generally applied to the actions one's enemies and opponents do you think we should have a page on carnage and bloody slaughter as well as massacre if not why not also i would question much of what you have listed above for example the earliest source which is the area of the oed specalises in is r lindsay hist cron scotl ii the xxiiij day of august the grytt murther and messecar of paris wes committit for the noun and j penry viewe publ wants wales men which make no conscience for gaine sake to breake the law of the ternall and massaker soules are dangerous subjects for the verb and this is a dictionary issue not an encyclopaedia issue i would go through others but lets skip strait to the categories you have suggested for example there is a strong case for saying that many massacres are not human rights abuses because the term is attached to many events that are not or were not human rights abuses for example there is nothing in the dictionary definition that stops any mass killing within the laws of war being described as a massacre but that is not a human rights abuse or are you going to make up a roll you own definition