I mean I'm against the government keeping secrets from citizens
The real problem is that it's rarely just a case of the government keeping secrets from citizens, as much as it is the government keeping secrets from potential foreign powers/enemies.
Very few people will come out and protest how hard the government clamped down on nuclear secrets when working on the Manhattan Project. We all generally sort of agree on some level that you probably want to hide what you're working on there, and you definitely want to hide how you achieve whatever you accomplish, especially when the guys on the other side are literal Nazis. It doesn't really make sense to tell everyone you're building a stealth bomber - and how you're doing it - so that they can immediately start working on countermeasures. Like it or not, there's a sort of implicit need for secrecy when it comes to developing military tech.
The real problem is that people have built up this huge artificial mental image of exactly WHAT secrets are being kept. So even when secrets are later revealed, no one ever believes them.
And ultimately, the government is completely fucked regardless. If they revealed every single government secret ever, conspiracy theorists would just ask what secrets they're still hiding behind the illusion of total transparency.
This whole Storm Area 51 is just a disinformation campaign!! Clearly they're going to let us storm it, find some secrets -- but not anything good -- while including wrong information to distract the US public!!! ---
"If I were a ghost, this is certainly the kind of place I'd haunt." (\/)(\/)|-|