Maybe you should care about what your government does in foreign countries. Particularly when it is routinely murder and manipulation, as is the case with the U.S. government.
That aside, I invite you on a thought experiment:
Let’s say everyone took your advice and just let the government hide whatever it wanted because it is a “state secret”. Let’s say then the government goes ham and commits a bunch of atrocities. What would stop it from declaring them state secrets to prevent the public from knowing about them?