Who has the Voynichese mindset more?

[Mark Knowles]

Maybe they realised that even they could not read their own cipher or that the contents of the manuscript was not of much value i.e. bad medicine or bad science. 

This kind of reflection would be unusual in the medieval context. If you have a reason (some authority) for writing something down, you are not going to disprove it empirically and then regret that you trusted the source. Especially in the field of medicine, they could get away with a lot. For example it would still take several centuries after the Voynich was written for people to realize that bloodletting wasn't a cure for everything.

I was thinking of the analogy with Giovanni Fontana and wondering why the authors of the Voynich chose not to publicise it.

In my experience of life, psychology can be very individual, so human motivations can cover a very wide spectrum. There are things that other people do that I cannot understand. I find watching sports makes little sense to me. When I was younger I could enjoy playing some sport, but watching sport I have never enjoyed. This is a feature of my own personal psychology, because as I know many people love to watch sport whether in person or on the television.

For this reason understanding the motives of the Voynich author(s) is and probably will always be, even after it is deciphered, the hardest thing. As motivations are complex, specific to each individual and may not have been documented in the Voynich or elsewhere.