News of these things does come out from time to time, usually over a shorter time period, and these create embarrassment, shock, pain and anger, but has any had significant substantive consequences? Here is a hypothetical one to consider: FDR secretly informed Hitler that the US would support an invasion of the USSR - how far would be the consequences of such a revelation reach, if it were revealed today?
It's not so much about the impact of the secrets leaking. Instead, its about the impact on communications if diplomats need to worry about their communications leaking.
