I’ll tell you a little secret about the krait, that’s perhaps not so secret, but that may help you understand how and why they’ve changed since GW1. The krait once believed themselves to be the top of the food chain.
But, in these intervening years, they’ve been attacked, driven from their deeps, scattered into smaller groups, and forced to move into more shallow waters. The rise of the dragons gave them a little taste of humble pie. (http://wiki.guildwars2.com/wiki/Unending_Ocean)
This group of krait are hungry to regain their previous level of power and confidence, and they believe that the one way they can do it is via their prophets. And Scarlet offered them a chance to take back what they’ve lost.
As the wiki says, “Krait doctrine fortells the return of the obelisks’ prophets, bringing with them massive armies to flood the surface of the world and destroy other species.” (http://wiki.guildwars2.com/wiki/Krait)
They may have wished they could do it a different way, but this particular group of krait agreed to Scarlet’s offer of obelisk shards and the chance to “grow” a prophet.
Are we playing the same game? The Kraits were all over the Tarnished Coast by the time the heroes of GW 1 reach the EotN and I am pretty sure they would have knew they weren’t the top of the food chain with all those Dinosaurs running around and chopping everything with their Twisting Jaws.
As for the recent Kraits that came out of the sea, I can’t fathom to think that they would place their alliance with Scarlet with all the thing she done for “them”. After having their prophet kill, having countless of countless of Kraits dead in those countless amount of Living Story events, having them work with an equally xenophobic group of sylvari (which I can’t fathom as to why THEY would work with Scarlet) with no other reason other that combining toxin, and watching your employer insult you with all those “sssssssssss”, you would think there was a point where the Krait would just abandon Scarlet altogether. But I guess I am not in charge of writing up the lore and making it “sense” to fit the Living Story.
The Kraits are better off allying with an elder dragon.
The Nightmare Court would ally with Scarlet cause what she is doing is their thing to a tee.
The Krait were top of the food chain in the same way humans are. Krait were a society and if they wanted to they could have slaughtered the dinosaurs or other large predators. They were top dog until an elder dragon came along and utterly kicked their kitten.
The Krait are a theocratic society. There religion is central to all they do. Scarlet turns up and offers them the equivalent of fragments of a relic which would cause the second coming. That’s huge for them. They may hate Scarlet but what she offers them is too good to pass up.
And no one would be better off allying with a Elder Dragon.