I agree with this. I've got to say, @Kdtym10, that Unit 731 page is macabre. I hadn't heard of it before. Am shocked at what seems to be continued dismissal by the US and Japanese governments.
If we accept that most people are neither wholly kind nor wholly cruel but can be manipulated into cruelty with depressing ease, then religion is one of the means by which they can be manipulated. We're pathetic creatures, really - as pack animals, we'll go quite a long way to be accepted, gain peer approval, and defer to authority. That 'all together' feeling you get in a football crowd, at a demonstration or a packed concert, etc is visceral and we know it can lead to extreme behaviour.
I've got no magic answers. I'm heavily in favour of teaching critical evaluation and independent thought. Even so, we are what we are because consensus usually keeps us alive longer. You can't train the pack instinct out of humans, only hope to modify it a little.
Big ideas like religion and nationalism can create powerful bonds between huge numbers of people. They can be constructive or destructive; that depends on the leadership. Unfortunately, power attracts more destroyers than helpers.