And maybe all the "New Kryptonians" were really goa'ulds <g> It would explain a lot...
Anyway, I agree, the Stargate program would still be secret. Having one lone benevolent alien flying around helping people is one thing; knowing that there are masses of homocidal aliens gunning for your planet is a totally different thing... though I expect they might get Superman involved for the "mothership in orbit" problems...
Interesting question!
PJ