If you look for examples of something good, or something bad, you will always find them.
I think, when we look at all social phenomenons, we need to look on the whole system. What is the role of religion? When religion is not there, what fits the hole? (Nowadays, there are many non-religion religions like consumerism, extreme-individualism, or global warming; all of those have their own prophets, the story of fight between good and evil, rituals, inherent sin and a way to 'buy out' out of that sin)
The Taliban shows it is not always thus. Nothing is that simple.