For what it's worth, I strongly disagree -- the group as a whole (and especially its leadership) is responsible for the policies they decide to institute, and the incentives they allow to exist. For example, in this article's story the author is apparently working >80 hour weeks directly manipulating the $500M spacecraft two weeks before it launches. Do we really think they are "directly responsible" for the described mistake? I think a root cause analysis that placed responsibility on any individual's actions would simply be incorrect -- and worse, would be entirely unconstructive at actually preventing reoccurrence of similar accidents.

I think this is furthermore almost always true of RCAs, which is why blameless post-mortems exist. It's not just to avoid hurting someone's feelings.