It's been said that if you build a better toaster, someone will figure out how to use it to better electrocute their husband with. As much as I would prefer that scientific advancement be used to uplift humanity, reality reminds me that 5 minutes after the first cave man used a rock to help him hunt food, he bashed his neighbors head in and took the bigger cave.
I would prefer that scientific progress be used for peaceful purposes. However, the reality is that there is more funding for military and government objectives than there are for peaceful purposes. On the plus side, many projects that were once the domain of the military are now available commercially. Best example is GPS.
Any progress that helps bring peace to the rest of the world is better than any progress that could ever be made for military gain. War is foolish and just harms other people, the world needs to learn that science is for helping the people and not for killing each other.
I definitely think that scientific progress should be used for the progress of peace. It should always be the first step for mankind to make peace a priority. And if we can use science to do that, we should make it a goal. But it isn't always a possiblity. And sometimes, we will have to use scientific progress to advance miliary hardware.
Scientific progress is the key element that keeps our entire world progressing. It would only seem logical that scientific progress should be used to increase the amount of peace we have in our world. In a world that is rapidly progressing in scary and negative ways, scientific progress could be used to maintain peace and harmony in our world.