Disoriented world mafia

Controversy exists about the origins of global genetic diversity.  A recent investigation initiated by National Geographic supposedly leads us all back to a collective history together in Africa.  Apparently, we evolved from the apes, to Neanderthals, then to have dark brown skin and hair before diversifying.

When European explorers set sail over 700 years ago, the lands they "discovered" were already full of people.  In this sense, they weren't the first humans to live in the places they colonized.  The encounters with natives were often wary or violent, but they were actually reunions of a close-knit family of individuals with apparent irreconcilible differences.  Why do power struggles evolve?

Consider that National Geo traced DNA back to Africa and followed the DNA trail to meet families all across Central Asia.  It is conceivable that their ancient generations walked  through the Asian continent and across to what is now Alaska when a land bridge existed.  This humans passed through vast territory and faced daunting climate to eventually migrated to North America.  They diversified again into Native Indian tribes.  Some of their ancestors moved still further south, as are recognized in lineages of Mayans in Mexico and Indian cultures dispersed throughout South America. 

All this said, why would blood family worldwide evolve to fight, compete for power and kill each other? If we're interconnected biologically, culturally and ethnically, and spiritually, why perpetuate indifference and conflict among modern ancestors? Do you sometimes feel like cultures are perceived as disoriented world mafia with amnesia about their past? Come what may, life will evolve again.  Some people would argue another widespread evolution in human mindset is long overdue.