The siege of Caldari Prime remains one of the most oft-talked about RP points between Gallente and Caldari but still one of the most vague.
It's really not clear what the objective of Gallente bombardment was. We know that a fascist government grabbed the power reins or whatever. If the objective was genocide, then that seems a little extreme from what we know of the compassionate Gallente public, though it is possible that this fascist regime did not have the support of the public necessarily.
"Caldari Prime burns, those left behind are choking on the dust and ash that fills the air, and you demand our surrender? Is this a joke? You have only hardened our resolve. Every drop of blood you have taken from us will be repaid -- with interest."
- CEP response to Federation demands for unconditional surrender after initial bombardment of Caldari Prime. CE 23155.1.18
From here, we learn that the Federation demanded a surrender after the bombardment. So perhaps we must break the old sci-fi trope.
Orbital bombardment =/= Genocide
Orbital bombardment = Carpet bombing
That's the issue, I think. There's a natural tendency to associate orbital bombardment with trying to destroy a planet or wipe out a race. We know the Gallente sent in "troops to take control of the planet" in tandem with the bombardment, so it sounds like it as merely something like the firebombing of Leipzig or Dresden or whatever it was, or the dropping of the nukes on Hiroshima and Nagasaki; an extremely aggressive and violent campaign to force surrender/capitulation and impose subjugation, not genocide. I'm not sure what the Federation would benefit from that, or why the population would endorse such a thing.
As for the bloodlines thing, I really find that one of the more interesting lines of Caldari PF; it only really ended up being Civire and Deteis because the game limited 2 bloodlines to each race. I thought that was sorta funny, really. "In the future, each and every nation will have 2 ethnic groups", but of course there was groups in the background. From this, we know that every race had multiple ethnicities on their homeworld. Minmatar had 7, Amarr had 3 and Caldari have an undisclosed amount. The Gallenteans likely did have multiple, but probably now are a bunch of mongrels; if they're all cooperative and libertarian, and not putting much stock in ethnic group, they probably bred amongst themselves.
Makes you wonder why Achur wasn't tacked on as the 3rd bloodline as a bizarre bunch of hanger-ons, when we could have had another Caldari Prime bloodline instead. Even today, I wonder why the Civire/Deteis haven't mingled over the generations?