Seems to me that "research" isn't really the right word in a lot of cases, as they would be people just obsessively interested in their various subjects that whether they are in fact digging through mouldy old texts in obscure university libraries, or just gathering as much information as they can from the news media or where-ever, it's more a case of trying to sate a desire than what could be called calculated, rational research. So when it comes to putting out a release, from the shortest C.5 min cassette to a triple box set, the very information, and the desire for it, is at the heart of the desire to convey it to others.
Maybe it's a chicken-and-egg thing. Did the investigation into certain topics come first, or the desire to put out a release on that topic? For example - Mike Dando of Con Dom said that he was fascinated by the work of T.E.Lawrence. Seems in that case, the interest was already there, and it made sense to him to make recordings around the interest. And his "How Welcome is Death to I Who Have Nothing More to DO but Die" album, if I'm remembering right, was more about his direct experiences with an elderly relative wasting away in a nursing home.
I'm sure there are releases that are based on someone coming across a topic, thinking "that'd make a good Noise release", then that someone doing a bit of Googling or whatever. But there's something about that I'm not sure I trust.