Diversity does not mean tolerating bigotry directed at minorities. It's crazy that you talk about tolerating disagreement when Eich is the one who donated money to criminalize what he disagrees with.
The bug was found due to observed behavior, not due to a code review.
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In an interview with ZDNet, Ballmer said his biggest regret as CEO was in how Windows Vista was developed.
The aftermath of Vista is precisely when he should have resigned. CEOs of other tech companies have resigned for lesser debacles.