Actually, they're supposed to be intelligently chosen to shake things up...
Yes, I believe that there are certain sets of circumstances that will trigger the events.
Pirates are much meaner
I just had a game and a Minor race came in and wiped out 8 colonies
The most common comment about the Pirates! used to be that they were underpowered. (Much like what has been posted here re the Dread Lords) When I get them now, 'ho, hum' never enters my mind. As for the minors, players asked that they take a more aggressive role in the game, and it seems that they now do so. I generally play with a lot of minors, and have yet to experience the new Snathi. Thanks for the 'heads up', jpinard, I'll squash them like a furry bug asap when I see them.
The devs play the game.
Sure they do. Over and over again. But there are only a few of them, and we are multitude. What seems to work well playing a few dozen games may not when playing a few thousand dozen. To their credit, they listen to us, and when they deem a certain aspect of gameplay truly out of balance, they correct it. I have little doubt, that in the near future I will be reading posts painting the Dread Lords in a much different light.