That's pretty much where I intended to go. Hell, in the campaign where I actually intended to do Shivan POV missions, it was going to be a major theme; they're always so calm about everything, like they're in total control. The GTVA side is over talking about great victories and the Shivan side is "meh, they blew up a couple juggernauts, redeploy the fleet some and we'll sort this out". Everything you find out just leads you further towards the conclusion you're ****ed.
But it's never explicit why the Shivans want us dead. It's never entirely explicit they do want us dead, even.
Sounds baller. If you aren't up to speed you should swing by the BP forum and ask the analysts to fill you in, I think you'd like a lot of the stuff they're finding (and I'd be very happy to have your reaction.)
While we are here on this favorite topic of mine here are my thoughts on the basic, seductive Shivan Answers:
Shivans are ancient von Neumann machines executing a program of scouring and supernova: as close as we have to canon, explains Capella and the Ancients. Simple. Allows some decent cosmic horror. But very familiar and leverages neither Bosch's crazy monologues nor the 'symptom of a larger problem' hint from

. Can tell a fine story if you present it well.
Shivans are gardeners on ethical or ecological grounds: ugh. Let's set aside the awful 'protecting subspace' variant and go for 'suppress hegemonic species'. Cosmic judgment or diversity protection seems supported by the FS1 outro. Reasonably elegant and believable. Doesn't do a great job with Bosch's motives - why would he think it was necessary to ally with the Shivans and ditch the Vasudans if they like nice people? Doesn't do much to explain Capella, though you could finagle it. Appealing creator/destroyer duality but the presence of clear objectives diminishes menace.
Shivan hostility is the result of a misunderstanding: even attributing individual consciousness to the Shivans softens their menace. I am very wary of any theory which posits common merkwelt or the basis for semiotic exchange. Does nothing in particular to use any of the clues V left for us, which attribute only direct violence and puzzling violence to the Shivans. Makes Bosch seem like a dork nerd.
Shivans are a space bug hive mind with queens and ****: get out
Shivans are a Nash equilibrium in a game between civilization strategies: hellll yeah now we're getting places. I mean this doesn't explain **** but it's not lazy and it doesn't lean on habits of anthropocentrism.
Shivans are an irreconciliably alien force whose role in the narrative is to corrode the deep assumptions of human primacy: yes but it's cheating to stop there
I dunno, what did I miss.
So would you be okay with me PMing you my ideas? I would love to talk to someone about it.
NGTM-1R: That actually sounds really cool.
Yeah hit me up, or both of us. Also I just ran the Installer on Blue Planet/Blue Planet 2 and it worked fine! Try it. Go to custom, select those two and the 2014 MVPs if you don't have them.