I think the very issue with this mindset is the essence of the problem.
Do not unite anyone. Do not fix anyone. Just respect every individual.
Every change starts from within. Each individual's universe is unique. Focus on raising your awareness of it. Cut the line of truth with ever higher frequency until you become the evolutionary impulse yourself. Become the source.
NAP, the Golden Rule will unite everyone who follows it on human level, but our consciousness is much more than mere human. In the human understanding on current level of evolution of our awareness, full unison is not possible. Our 3D brain works on opposites, dualism, yin-yang. You cannot have something united without something not united just as you cannot have up without down, nor left without right. If something is on, something must be off. There would be no reference point otherwise. There would not be any thought if there was no absence of it for the contrast. There would not be biological life without biological death, but life itself is much more than biology. Meaning of life as perceived by thoughts, would loose its purpose. We would not be human anymore, but the source, the unity. Uniting everything would mean being before biological birth or after death. The united world is unspeakable or unthinkable. Unison is the state achieved in deep meditation or psychedelic experience.
I hope this makes sense. Hard to think of the unthinkable, especially on a hangover ;)