Prove it. Please cite any contemporary Catholic sources that agree with this. (Non-Catholic sources can't be trusted on this subject).
Catholic and Protestant sources will tell two different accounts. Both sides wronged each other at various times in history. Historically there were a number of saintly Catholics who lived up to the Christian ideal (I have read and treasured their writings). The same goes for the Protestants.
I think the attrocities committed were motivated by chuch/state intermingling, greed, and lust for power; more likely a political agenda wrapped in a cloak of religion. There always have been, and always will be, wonderful examples of Christianity in both the Catholic and Protestant churches.