I like the idea of supporting the world: giving aid, helping build infrastructure, fighting diseases. You know, those kinds of things that lead to a better quality of life. People in need deserve help. If we could help bring the whole world out of poverty we'd have a much more stable and safe world.
I'm more ambiguous on involvement in conflicts. It's not always easy to see how involvement could improve people's conditions since you risk escalating and exacerbating the problem. I'd love, for instance, for someone to go into
those diamond mines in Zimbabwe were people are raped and tortured, and take those thugs running it and throw them in prison. That would be the right thing to do, but it would also cause turmoil, possibly leading to a backlash or reprisals against even more innocent people.
I guess on principle I'm for involvement in the world, but in a practical sense I think it's very difficult in some cases to act appropriately and without causing further harm.