Well, I wasn't really expecting direct answers, that's what the rest of your projects are for!
But that's good to hear the Shivans are being treated more like a force of nature or a plague than some sort of morality omniscient cosmic janitor that sweeps away the naughty races every so often.
In fact, I think that plague analogy is a good way to put it.
Are virus and bacteria a part of the natural order of things?
Yes.
Do they routinely kill humans?
Yes.
Does that mean people will let them do as they please?
No, that's why people create antibiotics, vacinations, etc. You might not be able to get rid of them, it would probably be a disaster to life as we know it to try, but that doesn't stop humans from trying to save themselves. Its in our nature to survive, no matter the odds.