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I don't claim that the "Linus's law" is true, I only point out it was used by some open source evangelists. It took decades and a few high-profile bugs to show it's not that simple.

As to the core of your argument, I think your position is too extreme. It depends very much if the software was developed using formal methods and a specialized language. Safety-critical systems are rarely open source, and yet a lot of effort and resources is put to make them secure. That other project choose time-to-market rather than security is their choice, not something inherent to open or closed-source software.