What they say above. The required researches for that event to fire, as I mention in my guide, are:
[...] Stop Targeting Civilian Traffic.
Yeah, that's the one that didn't seem urgent to me.
As I said, I have a lot of research topics, and the backlog seems to get longer with every month. I can no longer claim to really "manage" anything: Items near the top or bottom of the list have a much greater chance of getting attention than something hiding in the middle of the stack.
...is that part of the usual XPiratez experience?
EDIT: sounds whiny, and yes, it is

The kind of research I do now is rather boring, plate mail and kustom guns and jet planes. Which might have been exciting a year ago, but now are inferior to what I already have, Maybe that means that I have chosen my priorities well and got the good things first. Still, it seems like I have to cover all the boring stuff as well before the excitement can resume. Judging from the number of topics and current rate of progress, I'm looking forward to six months of not much notticeable progress. Is there a way to skip this?
I've occasionally checked the tech tree for dependencies, but by and large have managed to not spoil myself about future events. On the one hand, I'd like it to stay that way. On the other... if there is a Tome of Much Knowledge to be found on the Moon, please tell me how to get there quick.