no i think it's because they have no knowledge
But still they believe in what they doing, so this fact makes it a lil more bearable to me. You know how many people the Christians have murdered in their crusades or the Muslims. Millions of people in the history were murdered brutally out of religous inspired motivations. As Africa is way behind, there's still the bullshit going on what was normal for us in the middle-age; They will catch up, don't worry.
What fucks me up waaaaay waaaaaaaay more than that is stuff like the Dnepopetrovsk maniacs, teenagers murdering 21 helpless people with cruelity beyond imagination just outta boredom, with no motive at all. That stuff fucked me up literally for weeks when I saw the video and learned about the whole story behind.