I have been in places where a team can say "Mea culpa" and the worst thing that happens is next incident people grin and give them friendly jibes. Of course reasonable actions (workplaces can be unreasonable too...) are taken to ensure it doesn't happen again but that is simply part of the learning process.
I have also been in places where vast majority think the issue points at one team. They are silent on comms despite being present. Then miraculously the issue is gone. The response to the question of what changed? "Nothing." And we all go to bed having suspicions but no concrete answer...
Attitude is also related to many comments here expressing concerns over "people watching my screen" or "over my shoulder".
In times of crisis, if I am running a line of investigation then having a second pair of eyes is reassuring! If I think "maybe this thing is related" and someone more experienced can simply glance at it and say "Nope" then great. My idea had it's day in the sun and the group can move on.
And if you really really think it is still related then you can keep investigating without people looking - but as a second priority to group.