What possible extrapolations do you think they could obtain from such a small sample set that could be applied against society?
Not that it’s a bad idea or anything, especially considering how hard it is to take these people alive, but I would wonder what value such a tiny population could provide.
In what way would you go after that? Again we have to consider the mountain of people who may fit the bill via the established psychological profile who haven’t or won’t ever commit this act … again these people are extreme outliers and it’s dangerous to lump in likewise individuals most because they happen to share personality and behavioral traits but have otherwise never harmed anyone
Not only that, but given (in an absolute sense) how rare mass killings are, even ignoring the difficulty of a live capture and study, are they frequent enough to gather viable data about the population faster than the societal changes will rotate your older data to obsolete status?
If you could snap your fingers and magic into existence detailed data about 10M different people, all of whom ‘commit’ mass killings, I’m absolutely sure you could use that to apply something to the public in some way. But given we’d need to transition to a capture approach with mass shooters (lol) to even entertain the idea, I wonder if the juice is worth the squeeze.
‘Of iron is the last,
In no part good and tractable as former ages past.
For when that of this wicked age once opened was the vein, Therein all mischief rushe`d forth; then faith and truth were fain,
And honest shame, to hide their heads, for whom crept stoutly in,
Craft, treason, violence, envy, pride, and wicked lust to win.’