The popes used declared crusades to fight their political and religious enemies for almost 500 years and it’s pretty tough to assert that they were all battles against evil. Or Holy.
Many were proclaimed against Hussites, Russian Orthodox and other Christians. Even the Holy Roman Emperor and Italian noble families.
Yes, power has always corrupted. The Catholic Church also condoned theft from Aztecs and Mayans if they got their cut. But today they are not nearly as bad as the Islamists.