Also, at some point, it's categorically imperative to accept or conclude that someone will simply never tell the truth or own up to the faults/failures. Their c

Also, at some point, it's categorically imperative to accept or conclude that someone will simply never tell the truth or own up to the faults/failures. Their continued denialism is more about their internal mental health than reality. Treat them with care and preferably distance. If you must interact with them then document absolutely everything important with photos/screenshots, emails to yourself, and whatever supportive documentation you can wrap around yourself. Denialism turns into gaslighting which is abuse and must be handled properly, carefully.