it seems that Jesus would have forgiven the whore, the heretic, the sinner in this life, but the Popes did not see it that way, so it seems, given they burned and killed (had killed) millions over a period of 800- 900 years.
And Popes who committed murders are regarded by he Church as murderers, not saint.
For instance, Pope Innocent III died suddenly at Perugia on 16 July 1216. Innocent III was believed to be in the flames of God's punishment on the very day he died. He appeared to St. Lutgarda in her monastery at Aywieres in Brabant, (modern-day Belgium), which is impossible to account for naturally, since they would not have yet known, even in Rome, that he had died in Perugia. Engulfed in flames, he declared to her, “I am Pope Innocent”.
He continued to explain that he had had the grace to repent of his sins just before he died, but was in Purgatory for three evils which required him to be purified for his remaining attachments to sin. Innocent asked St. Lutgarda to come to his assistance by prayer, saying, “Alas! It is terrible; and will last for centuries if you do not come to my assistance. Help me!” At that moment he disappeared and St. Lutgarda informed her sisters of what she had seen, writing letters to all her allied nun's communities. These letters still exist: this is how we know she knew what she knew, and when she knew it!
My point here is not to start an argument about the reality of mystical visions or the docrine of Purgatory (please! don't let's argue about that right now) but to point out that murderers are considered murderers, even if they are Popes.
In Islam, they would be saying he was a Shaheed and would get to enjoy his 72 virgins. In Catholicism, he is considered to have just missed Hell by the skin of his teeth and the mercy of the Lord Jesus, and still by God's justice engulfed in flames for his sins, which included some of the the worst aspects of worldly wickedness, aggressions and cruelty. The Albigensian Crusade was only one of them.
Damnable? We can only agree. There have been 266 popes, some great, some good, some very, very bad. But the bad ones are not emulated nor honored. They are not our saints.
As the comedienne Gilda Radner used to say, "If you can't be a good example, you'll just have to be a horible warning."