... In this game calculated aggression pays out nicely. If you're not expanding on account of other races, you'll lose at the end, because most AIs do. ...
End of Iztok's quote
Iztok's reply is on the money if a high score is your main goal--the scoring math strongly favors aggression.
But plenty of us just like to play, and if you're interested in an Alliance victory you can most certainly have a good game with the Drengin and Korath on the board. (I admit I shun the Drath, but I probably just have a bad attitude about their Super Ability.)
Also, I tend to stay in a basic settings rut for the maps I play, and I have definitely seen more than a few games where the biggest aggressor on the map was a so-called Good civ like the Torians, Iconians, or Altarians--even with Drengin, Korath, and Yor in the mix.
p.s. All these AI behavior remarks from us 'old' players should be taken with a bit of salt b/c Stardock have been diligent in steadily tweaking, and mostly improving, their behavior.