OK, here goes my attempt - I have already posted elements of it elsewhere on this forum, so apologies if I sound like a broken record ....
Gradually it was disclosed to me that the line separating good and evil passes not through states, nor between classes, nor between political parties either -- but right through every human heart -- and through all human hearts.
- Aleksandr Solzhenitsyn
What got your DNA through the tough survival tests from Australopithecus to Homo Sapiens? Hell, what got it through from a tree shrew to primate? I'll tell you - EVIL. Murder, rape, slaughter - nature 'red in tooth and claw'. You owe evil for your presence today - BIGTIME. Evil has been your friend, and could be your friend again if your DNA finds itself lost in the wilderness without a hint of civilisation. Evil is humanity's backup system if shit hits the fan - without it human DNA is too vulnerable.
The good news is that we are no longer red in tooth and claw - we know that if we form a line side by side with other humans and sweep through an area of countryside we are more likely to find a source of food, that will benefit each individual more than if we go alone,
if shared. Sharing - charity - becomes an integral core of this human 'society' - if I am lucky and find the food today and share it out, then tomorrow if (and likely, when) I am unlucky, my other lucky fellow society member(s) will share his luck with me. In this way human society acts like a net catching various resources, with no one part of the net being any more valuable or deserving than another. The health of every individual is valued so that more resources can be identified and 'netted' by healthy eyes and healthy limbs. Humans have continued to embellish this system to the extent that they are no longer vulnerable to the old conditions their DNA evolved within, and so the 'evil tendencies' of humans remain as a kind of useless and redundant DNA. However, what has come as a result of the relatively recent complexity of human societies are 'complexes' - we easily get tangled up in the complexity and get lost in it.
Anything which breaks down the underlying social survival strategy is deemed 'evil' - the murder, the rape, the slaughter. Humans all seem to instinctively understand how the charity and reciprocal care system works, and yet breakdowns in the complexities of modern societies often sever the global social net in various places, causing the humanity net to freak out temporarily, revert to EVIL just in case - reacting to what seems to be the approach of an uncivilised condition, and then self-repair. But without a global blueprint to purge any new unhealthy appetites or habits triggered by the evil, the repairing net just makes do, and fills in the gaps in ways which conflict with neighbouring nets - sealing evil into the net itself. It then takes time for the society to purge itself - change laws and values, so that civility and social cohesion can once again rise. Mindfulness appears to be the ideal tool for amplifying this purging process.
Mindfulness works with our feral instinct 'backup system' by simply acknowledging and accepting it - as a friend - this system has got our back and needs to be respected for that, and this befriending and accepting becomes exactly the process which diffuses the feral, evil, potential within us. This is because evil needs the sympathetic nervous system to be triggered in order to manifest, and mindfulness is too busy enjoying peaceful calm - negating clinging desperately to good things, and hitting the ejector seat button when bad things come along - to allow the sympathetic nervous system to rule the day.
Sorry about the blabbery-ness of that, but I hope it made some sense. I got a lot of it from Thich Nhat Hanh, actually, and JKZ talks a bit about our ancestrally-programmed stress response. A long time ago, when our DNA met a tiger, placing our hands together and bowing wasn't going to do a lot for us
That's when we needed evil. One wouldn't kill a tiger today, because one doesn't have to, but without evil instincts we wouldn't be here today. Mindfulness helps us to undermine our evil dimension, though - by recognising that evil is actually a part of 'good' - life sustaining itself.