Who said Helpmann was crazy? He's perfectly sane and rational, from his frame of reference. So are our governments. The issue arises when the subjective reality in which ones leaders reside and the subjective reality in which you reside are radically disconnected, which makes decisions and actions made by either side seem irrational and scary.
I'd argue that governmental secrecy is bad, in all its forms, as it always ends up being abused, from the perspective of the cit. I understand your point, but it's demonstrably the case that secrecy begets secrecy, which begets corruption.
I stand by my parallel of Brazil, for we do not exist under a brutal, evil, autocratic government, nor under a consciously designed society intended to be "better", but instead under a self-sustaining zombie bureaucracy that no longer connects to the world it governs, and in fact is attempting to reshape the subjective reality of others to suit its own ends - which are, in fact, none, other than perpetuation of the status quo and hegemonic systemisation of anything which conceivably can be - which was the crux of Brazil.