-When I choose 'lucky' as a trait, it seems to make more of these events appear. Is this my imagination?
I believe that it does. It should also increase the odds of getting good tiles as well. In the Dark Avatar expansion, it also affects the minimum damage your ships do.
-If so, then am I right in thinking that, since most planetary events have a negative impact on 'good' civilizations, that playing as a 'good' civ it is in fact generally unlucky to generate planetary events, and that for 'good' civ's the lucky trait is a disadvantage?
You will continue to get these random events until you research "Xeno ethics". Its the lowest yellow tech in the tech screen. Sadly, thats reason enough for me to research Xeno ethics. I like playing as the good guy and not to get punished for it.
Evil on the other hand can often afford to not research xeno ethics. In theory, if you were to play long enough, you could gain more power by not researching Xeno ethics, and select the evil decision every time an ethical even occured. I tend to think of this as the "forth alignment" in the game.
It seems that the devs tend to think that, in order to be good, you have to make stupid decisions. I can think of better things to do than act stupid, or evil. How about smart good.
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Maybe I'll create a new post or something...