I suspect you are getting into some myth-making yourself here. The inquisition was not originally focused on witch-hunting, it was focused on heretics - people challenging or denying the the doctrines of the Church. Bernardo Gui and The Name of the Rose is 14th century, while the large scale witch-hunts only started in the 15th century with the publishing of "Malleus Maleficarum".

> The truth is that Inquisition aim was exactly opposite: to stop chasing and burning innocent woman (and man) by all kind of petty lords and civil "courts" who used witchcraft accusation to get rid of opponents.

I suspect you made that up, given the anachronisms in your account. Do you have any legitimate source which confirm this narrative?

Bernard Gui was certainly an educated man, and he is described as as such in Name of The Rose. He also was responsible for a lot of torture and death, persecution of Judaism and so on. You can consider this "decent" or not pending on your personal values. The Name of the Rose Eco actually has a reasonable good treatment of the philosophy behind the heretic movement and the inquisition, despite the book being fiction.