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1/ Boeing is shipping a software patch for the MCAS system implicated in the two 737 MAX crashes. Many people are calling the problem a "software bug". This is incorrect. It's a design flaw, not software flaw.
2/ I mention this because there people who want the government to regulate software bugs/vulns. They cite disasters where software is involved to justify their desire to regulate. However, much of the time, a software bug/vuln isn't at fault.
3/ Such is the case here. The software is behaving exactly as design. However, the design was to rely upon a single sensor to control the tail fins, and if that sensor was faulty, to cause the plane to dive.
4/ The same design could've been implemented as hardware circuit with no computer or software involved. It was a design decision that's at fault, not how that design was implemented.
