How many of them were involved in overriding the engineers as regarded launching the Challenger?
(I would recommend "Riding Rockets" as a pretty good book to read for a general overview of the safety culture in NASA management and the reasons I don't trust them to make this decision. Honestly, for all I know, things have changed radically since then -- but given that NASA management were the ones that sent them up on a Boeing spacecraft in the first place when years ago I was already able to see that Boeing was no longer capable of doing safe engineering of even civilian commercial air travel, I kind of doubt it.)