Not counting the more infamous acts of violence perpetrated by organizations such as the Spanish Inquisition (and whatever Protestant counterpart that may have existed), weren’t most inquisitions actually used for real teaching and conversion and not merely interrogation and attrition?
Granted, the policy of every inquisition was torture for the heretics who were the most consistant, however I believe the emphasis on the attrition lacks context. While I am in no way excusing the inquisitors’ methods in conversion and interrogation, the bulk of the inquisitons was actually a restrained form of torture for that time. This includes the incorporation of the Garrucha, Potro, and Toca. The more secular elements of the Midieval era were worse and put to use more often. It’s rather telling about the mentality of the Church even during the Midieval period (an underrated one IMO).
There was a really good article on this called, “The Defense of the Inquisitions.” I think it was written in Angelus, but I’m not sure.