could get more, especially in the fields of medicine and agriculture, if they were used for peaceful purposes
Would never happen. Any technology we received would be weaponized in some way. The focus of those in power is all about keeping themselves in power. To do that their only strategy is to go to war.
We are not all that creative as a species when it comes down to it. We can invent all kinds of new ways of controlling and killing each other, but not a way to live free and in peace.