Countries can surveil, do reconnissance, and remotely monitor better without risking human life. This enhances security and stability because there are less surprises.
Also if a drone gets shot down, even though it's expensive loss and the gesture is hostile, it's not so hostile that a lethal response is warranted in return. We saw this play out in the mass media recently.
I guess what I'm saying is that I never thought about these machines like this before. Even though they are military hardware, they are conflict-reducing military hardware.
In the same way we discourage the proliferation of weapons of mass destruction maybe we should encourage nations to develop high-level military-grade UAV capabilities?