An actual end to mass violence and cruelty would be infinitely more valuable than any of those things (except for clean energy).
People need to be more self sustained. We need technologies that will empower people and communities to rely on themselves and not depend on systems that are outside their control as much. I think that efficient agriculture in the hands of small communities, solar, 3d-printing, open sourced robotics and AI, open source and creative commons in general would help ease a lot of this tension. Violence comes from disenfranchisement and being socially marginalized, but if each community could stand on its own feet, this would be much less the case.
We need to reduce the gap between the super powerful and ordinary people to have a less polarized society, and I fear this will not happen through politics, but rather from technological empowerment. People are living today at a much higher standard than a century ago, and we have all seen the benefits of putting an internet enabled mobile phone in the hands of everyone - the things we could do today that we wouldn't have dreamed of 40 years ago... We just need to spread the benefits more evenly.
clean energy is infinitely more valuable than end to mass violence? That seems like a bit of an overstatement.