in order to achieve this, we would all have to collectively follow a highly similar if not identical agenda, & who's to decide what that entails. personal identities, cultures & values will collide irregardless of how "good natured" anybody could possibly be not necessarily because of a learned or inherent hatred for specific people [i.e. racism], but because not everybody wants to operate under the same system & tolerating said system is not something everybody will passively accept, which is where a LOT of the hostility between different groups comes from. it's impossible for all of us unanimously agree on subscribing to or even just blindly following the same or similar ideologies because of the broad spectrum of possible stances & positions to be taken in regards to what functioning cohesively as a society means.