I understand that the author is from NZ, and the software originated there, but surely the time to object was when the original (presumably US?) trademark was issued? Or at least some outrage could have been expressed at that point?
How are the Horowhenua Library Trust meant to know when the US trademark is issued? I can't imagine they're keeping an extremely close eye on all the trademarks being issued over there.
The first trademark was issued in Europe. BibLibre were responsible stewards and thus no objection was raised at that point. They acted as they stated they would: they applied for the TM on our behalf, received it, and were generous enough to sign it over to HLT at their expense.
Outrage was expressed over the US trademark and still is to the current day. It would be interesting to see how US courts find in this department.