"Love your neighbor as yourself", because it kind of covers everything. To love others is to always shows them respect and kindness, and put them before yourself. If we put others before ourself, we would never murder (or abort babies, I believe) or even say cruel things (in a perfect world where we would be able to love others constantly). Drinking and doing drugs wouldn't be an option, because that hurts people around you, and it hurts yourself. And everyone would be equal, no segregation for any reason, no 'upper class' and 'lower class'. I also think loving yourself and others would be a motivator. Those of us who are lazy or can't hold a job due to alcoholism or whatever would be motivated to get the education necessary to support themselves, and a family. And there wouldn't be any homeless pets or people because love would motivate us to provide for those down on their luck. And if we really loved each other, there wouldn't be divorce or single parents (unless due to the death of a spouse), so children would get the best start at life, and no problems at home.
That isn't real eloquent, and obviously it would have to be an ideal world if that were to happen. Don't know if you had to stick to realistic options or not.
My .02! Hope it helps, and good luck on your project!