I wouldn't pull punches in a good guy thread, if a mistake I didn't expect or want to happen occurred I'd mention it. I would also follow that with how the party corrected the mistake, speaking to their willingness to provide good customer service.
Mistakes are mistakes, it's not intentional and life happens.
The only time I see a bad BOI bad guy thread is one where the poster expects the community to believe them based on words. Ones with full record of everything that happened and a clear line of bad guy moves makes for open and shut cases.
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