I disagree with your statement. it's easy to keep a secret, if your life or livelihood is at risk, through blackmail or similar. You just haven't experienced it.

That is irrelevant. You aren’t being realistic or practical. The US government didn’t, and couldn’t blackmail every past, present, and future employee who may come across source code or documentation or communication about a backdoor for every company that produces a hardware or software product. They also did not blackmail every independent researcher who might discover one. To even attempt this and expect it to remain a secret would be incomprehensibly stupid and we would definitely know about it by now.

There have been cases where specific things were targeted. This isn’t even close to every piece of hardware.

“There are no mistakes” is a ridiculous notion for anyone who has ever had a career tangentially related to software or hardware. I don’t know how someone who holds this viewpoint even managed to find this website. You really don’t think bugs ever happen by accident?

It's fine to be upset at my point of view and implied experience within this area. I understand 100%. There are some coding mistakes that cannot be tested or caught during development and deployment. These can be exploited. There are however some that appear to be mistakes and are allowed or missed during the process.

This is a great website for freely expressing opinions, truth, lies and such!

Peace be with you.