And I think this is as good a reason as any for the truth in those words:
True this is an atrocity which anyone who has a conscience and humanity will be horrified at and could be condemned on the grounds that it is murder most foul, regardless of the motive.
When considering atrocities against children, like Beslan, Norway, this in Uganda, I've thought about how it is like the archetypical massacre of innocents recorded in the new testament, whatever the exactitude or literal truth of that incident, echoing through human history.
However, this community seems to be have been targetted, they've been targetted because they have attacked witchcraft and not just the massacre of innocents per se and they've made praying for an end to witchcraft part of their campaign since the authorities and police appear to be complicit in the practices.
From purely humanistic thinking I dont like the idea of things purchased through people sacrificing, most frequently, the lives of others. Not that I believe that people sacrificing themselves, for instance by immolating themselves or becoming a suicidal bomber, are much better, in some ways I'm not even in favour of self-sacrifice without any eventual reward which is short of costing lives or life. However, on some other spiritual level, this kind of thing vexes me, whatever sort of thing can be purchased with the suffering, misery and death of others has to be a cursed thing, delivered by cursed means. If the stones could cry out they would demand divine retribution surely.