Actually I disagree with many of the responses here. Harmony with others similar to yourself is what creates happiness and peace. The latter doesn’t have to mean carbon copies of yourself, but similarity on things that are the most important to yourself. This also means you won’t be singled out. Seriously, how many times do you hear people complain they feel they don’t fit in, feel they’re singled out or that they can’t stand to be around him/her/them because of how they think and behave? One only has to look around fluther to see my points here, let alone the world offline.
Looking at the state of humanity in the past and present maybe the idea of segregating and dividing people according to the types of cultures they would want to live in is a better idea than intertwining people of different tastes. The latter idea just puts more fuel on the fire in my opinion, and on top of that I highly doubt it when many claim to appreciate the thoughts of those who think differently than themselves, especially on those trigger issues that most of us have.
I can only answer this question with another subjective view on what I think would make the world a ‘better’ place. People would have freedom of, and freedom from practicing religion. Religion would not be a part of any political process. People would be able to power their own homes off of the grid. Gender roles would come to an end. People would have the freedom to grow weed and other psychoactive plants/fungi on their property, and property taxes would come to an end. Why should you lose your property after you already had paid for it?
I would also try to tackle many social problems and crime via a backdoor method. Instead of looking for scapegoats and tackling crime head on I’d be more concerned with changing the foundation of what really creates most of these problems to begin with. I believe that things such as gender roles, economical fairness, lack of work ethic and confidence being emphasized over empathy, humility and intelligence are the root causes of most of the world’s ills. Problems like drugs, conflicts, wars, violence, animal cruelty, neglect of children, violence against women, etc are merely byproducts of the issues I’d want to tackle in my opinion. Now would everyone want to live in my world or be like me? Something tells me no, just like I would never want to be like many others, or live in their world.