Being united as one comes with some flaws. If everyone thought the same exact way then we wouldn’t progress/evolve. The difference between people is what makes us human. It gives us arts, creations, and innovation. I believe we should definitely work for a better tmr but a better tmr is debatable.
People kill each other for resources, wealth, power, revenge and views. If your beliefs completely disagree with mine whether it’s right or wrong, it’s most likely going to start problems. If one group of people is committing horrible crimes to let’s say animals. Are you going to put up with that and just recognize that they do that and accept them for who they are? I’d bet good money you’re going to be upset at that and not want to see that.