X'D I have updated the OP with an explanation of why the Xim are not actually imperialist, because this is the third time someone has made that misconception.

They are very isolationist and non-aggressive. The war with humanity was because of other reasons.

I realize that the reason some people think the Xim are "evil" is because of the intro, but you should remember that the intro was written from a human perspective- it is biased and portrays them as way worse than they really are.