The expression used in aviation is, "Just Culture", within which the real root cause(s) of errors are determined methodically (MEDA, Kaizan etc etc).
If that exhaustive investigation shows that the error was the result of a deliberate violation, the person responsible will, quite rightly, be disciplined.
The newspaper report says:
In a probable-cause statement on the event, the National Transportation Safety Board says: "The senior ground agent then advised, 'Don't say anything' to one of the other ground agents who was working the flight with him."
Whatever the root cause of the error that led to the damage was, the senior ground agent seems to have
subsequently committed a serious violation and should be fired forthwith as being demonstrably unfit for his task.
A "No Blame Culture" is ridiculous; it simply means that if an irresponsible fool endangers safety, he or she will, perhaps after a group hug, be allowed to carry on as before.