Don't play goblins then. 
But I wanted to, it's fun being evil. 3:
'So your younger brother died of old age 221 years ago?'
I get the feeling that any vampire ballsy enough to become a civ leader (thus requiring them to eventually give up their authority to fuck off when the citizenry become suspicious) has reached the point where they're done giving a fuck.
EDIT: I rolled into the hillocks under cover of night, finding no sign of invaders. So I wiped the fuckers out. On my way back up, deciding to check out the dark pit the army is supposed to be marching from, I'm attacked by what I assume to be bandits.
EDIT 2: Made it to the dark pit that's in charge of the invasion. Good, they aren't hostile to me, and I got a pair of companions that are actually following me around properly. Time to visit the local lord and see about getting some action, since that miserable dwarf actually ISN'T the one directing the invasion.
EDIT 3: Only had to tell them about a single dorf I killed to get him to let me join. First mission is to...assassinate a surfaced animal-person, probably a chieftain. Seriously?
EDIT 4: Nope. It's an administrator for a conquered village, with signs of being fortified by goblins. Oddly, the admin went no-quarter on sight, while the civilians are ignoring me. Gonna hope that giving the oppressed masses a "change in leadership" doesn't piss off my comrades.
EDIT 5: My fellow goblins are fine with it. Funny, the villagers standing around just stood there and watched.