Not meant as a reply to the commenter above but to anyone else on hn, how come there's such incredible, richly detailed comments on, say, the history of S.U.S.E

Not meant as a reply to the commenter above but to anyone else on hn, how come there's such incredible, richly detailed comments on, say, the history of S.U.S.E. (personal stories of people who grew up with it, people who used to work directly on it etc), but with international politics it steeply goes downhill? I feel like the same minds being brought to bear on the latter subject could be similarly interesting.