Science, in and of itself, does not lead to peace any more than religion, in and of itself, lead to peace.
This is true. The shortcut I took is probably abusive. Science only contributes in the way it may help different people to know each other better. And this contribution to peace is probably (very) small. It is however non zero (at least in my opinion).
Scientists are often the agents of peace because they are informed. A good scientists understands both the benefits and dangers of modern technologies and actively pursue the best use of technologies.
The tendency of the scientific community towards peace comes from the character of the scientist.
Additionally, I must admit that the big game changer is definitely what you raised at the end of your previous comment. I didn't think about it initially, but it is true that a (good) scientist can assess pros, cons and the global situation from the very nature of their job.
Thanks for your valuable replies to this post!