The Xel'Naga did not manipulate their evolution. The manual specifically said that after the Xel'Naga helped them survive Zerus's harsh environment, they just let the swarm evolve on its own. Unless of course you're suggesting merely watching over them like that qualifies as evolution manipulation.
Now, for the whole ambiguity part, I'm not here to suggestion a black and white picture, but you don't make it so that it's intentionally left so vague that no matter what happens in the end you have to decide for yourself who's good and who's evil. But then again, I haven't seen enough of those types of stories myself, maybe they're not as bad.





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