[unsined]

I stumbled into that git issue and couldn't stop reading. He was immediately dismissive of the security suggestion, even when that person had gone out of their way to provide verifiable examples of the vulnerability. I ended up not installing the software.

[the_af]

You mean you didn't install Calibre because of a bug report where the author allegedly misbehaved? That's odd. A lot of open source software is riddled with ego and personality clashes, and because they play out in public forums, mailing lists and bug trackers for everyone to see, these flamewars tend to be very visible (also see: Linus Torvalds' outbursts). Do you also not use these programs?

Did you need Calibre in the first place? If so, what did you end up using instead?