Or they simply know more than we do. Maybe they've gotten the answers to "Why?" that we want and that convinced them? That's the "conspiracy" that almost worries me more. Not that I hold any real faith in such a thought.
1) The government has some actual legitimate reason to do all of this which outweighs the danger of excessive government power.
2) Disclosing the reason to the public would eviscerate its effectiveness.
3) Allowing the government to say "trust us, we're the government" about anything from now on and get a free pass, because it could be this situation, will not result in the outrageous atrocities that governments have been known to commit when government accountability to the public is literally prohibited by law.
I don't even buy the first two as being especially plausible, but the third is why this cannot stand.