I don't know if I'm so sure it's not working. They manage to foil and intercept a lot of potential plots. I don't think anyone can ever stop anyone doing something like this, whatever their motivations; as others have alluded to, it's just the realities of humankind. People will always find reasons to kill each other.

I think a nation raised on service would have a lot of problems; PTSD, dislike/distrust of authority etc. I personally wouldn't risk my personal safety for a ruling elite who couldn't give a shit about me.