There's not really much "willing to accept responsibility" here as far as I'm concerned.
Do we want a world of people who change their ways, even if for somewhat impure reasons, or a world in which no one ever does because it's pointless?
There is no reason to extend this philosophy to corporations though. We can decide to use a competitor instead. No one needs to show loyalty to a supplier who screwed up.
You forgot another option: not making the mistake in the first place.
"Farley maintains that the relative security risk of the vulnerabilities that security researcher Jonathan Leitschuh disclosed yesterday were not as severe as Leitschuh made them out to be."
That's the CIO still unwilling to accept what a poor decision it was to subversively install a web server on users' computers. They need to shut the fuck up unless the words coming out of their mouth are "we're sorry and we'll do better in the future".