The concept of racism, isn't actually rooted in evil, but it isn't used right. It's ingrained in any living being that has fight, or flight; which is everyone.

Our fight, or flight is always on, or should be, and it's what is meant to discern friend from foe, do we fight, do we run, do we embrace.

When ignorant, or young, we literally don't have enough worldly experience on average to comprehend friend, or foe on anything other than simplistic concepts. Depending on lessons, and experiences learned, or even lack there of, impacts what happens next.

The 'what comes next', is duration/age, and the remembered experiences, and lessons learned, and how they shaped us. I guess at this point, a person's full ability to create coherent thought, or use their critical thinking skills are either in full play, or full NPC.

I guess life, and life's lesson are like 'The Force', you can either learn them, and master them, or ride along spewing the responses npc's are trained for.