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Your post is similar to one I saw some time ago. That old post has a reply of mine, and I’ll paste it here:
The problem you’re describing (open sourcing critical software) could both increase the capabilities of adversaries and also make it easier for adversaries to search for exploits. Open sourcing defeats security by obscurity.
Leaving security by obscurity aside could be seen as a loss, but it’s important to note what is gained in the process. Most security researchers today advocate against relying on security by obscurity, and instead focus on security by design and open security. Why?
Security by obscurity in the digital world is very easily defeated. It’s easy to copy and paste supposedly secure codes. It’s easy to smuggle supposedly secret code. “Today’s NSA secrets become tomorrow’s PhD theses and the next day’s hacker tools.”
What's the alternative for the military? If you rely on security by design and open security for military equipment, it’s possible that adversaries will get a hold of the software, but they will get a hold of software that is more secure. A way to look at it is that all the doors are locked. On the other hand, insecure software leaves supposedly secret doors open. Those doors can be easily bashed by adversaries. So much for trying to get the upper hand.
The choice between (1) security by obscurity and (2) security by design and open security is ultimately the choice between (1) insecurity for all and (2) security for all. Security for all would be my choice, every time. I want my transit infrastructure to be safe. I want my phone to be safe. I want my election-related software to be safe. I want safe and reliable software. If someone is waging a war, they’re going to have to use methods that can actually create a technical asymmetry of power, and insecure software is not the way to gain the upper hand.