If it's a mistake that even a GitHub employee can make with very heavy consequences, is that entirely the fault of the author? When Lauda Air Flight 004 crashe

If it's a mistake that even a GitHub employee can make with very heavy consequences, is that entirely the fault of the author? When Lauda Air Flight 004 crashed because the pilots accidentally deployed the reverse thrusters in air, even though it was the pilot who "made a mistake", Boeing was forced to change their design and now the original design is considered flawed.