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When WannaCry was a major threat to cybersecurity, shutting down banks and hospitals, it was found that it used a backdoor Microsoft intentionally kept open for governments to use.
https://en.wikipedia.org/wiki/WannaCry_ransomware_attack
https://en.wikipedia.org/wiki/EternalBlue
In real life, if I do not prevent someone from doing a crime that I am aware of was premeditated, I am guilty of not doing my duty. Corporations are people thanks to Citizens United, and governments are ran by people, so uphold them to the same standards they subject the populace to.
Well. Your sources don’t say Microsoft kept it. They say NSA didn’t report it to Microsoft so that they would be able to keep using it.