The other reason it's difficult is the sheer prevalence, even in our modern culture, of the Black Legend which injected all sorts of myths regarding the Inquisition and Medieval culture. For example, the Inquisition rarely used torture, Torquemada only had 1% of his heretics executed, and there is only one documented instance of a woman ever being racked (and it wasn't even part of the Inquisition). The effects of the Black Legend were so extreme, that to quote the modern European historian Elvira Roca Barea:
"If we deprive Europe of its hispanophobia and anti-Catholicism, its modern history becomes incomprehensible."
https://en.wikipedia.org/wiki/Black_legend
Or, if that sounds too boring, broad, or controversial, here's History for Atheists admitting the Inquisition and witch hunts is one of the dumbest arguments for atheism, due to heavy involvement of commonly accepted myths:
https://historyforatheists.com/2024/02/the-great-myths-14-th...