Right. It always comes back to the people performing the task. Because people are generally "good" (IMHO), "evil" isn't particularly easy to get away with. This goes for geeks, police and even the military. Commands can be issued, but real people with real emotions have to deliver. This is why whistle-blower protection is so key to our economy and society.
And while politics may attract a disproportionate level of narcissists and sociopaths, I'm guessing CS doesn't.
I'd rather assume that sociopaths are drawn to politics because it's kind of a wildcard field (you can pretend to be expert and meddle in pretty much every topic).
That doesn't mean there aren't highly specialized and capable sociopaths out there.
And while politics may attract a disproportionate level of narcissists and sociopaths, I'm guessing CS doesn't.