I thought of this too.

We know another purpose this event had (beside showing "the balance" effect surrounding the Cleansing.. its price, so to speak). The Amayar made one of the choices that would be before Rand at the end (kill himself to put an end to his suffering and avoid the LB, destroy Creation to put an end to it all, or become body and soul the Creator's Champion). Of course, the Amayar also replicated even more LTT's choice after his failure, and his Kinslaying beforehand. That's primarly what RJ meant to echo I guess... The taint brought the Kinslaying and LTT's suicide to escape in death his mission and from his suffering, the Amayar slayed their kin and committed suicide as saidin was getting cleansed.

Only RJ knew what sort of rebirth awaited them for what they've done though... there really seems to be payback in WOT - several characters have been "punished" or "rewarded" ironically by the Wheel for their actions/decisions (Elaida becoming a damane not the least,etc.), which hints at a mechanism not very far from the notion of karma being in place.

But then... the Amayar/Da'shain/Tuatha'an "religion" makes them awfully passive. It's a lot about surrendering free will and letting the Wheel weave you as it wills, like water in the sea, like a leaf on the wind (there's also big remnants of this in the Aiel culture... life is but a dream you must awake from (so being an eternal soul in limbo between lives is "reality" is very close to the Time of Illusion doctrine). That would make those individuals the easiest for the Wheel to push and pull (ji'e'toh has a similar effect of "programming" some of your decisions) Perhaps it's part of the belief system to be "sacrificed" for balance's sake when the Wheel needs it. The Asha'man (and all the children with the spark) were all doomed to die but the Cleansing saved all of them; to allow for such a fundamental change in the Pattern (without tearing it apart, maybe?), the Amayar died in their place. Perhaps their prophecies were quite blunt about them having to die when the CK was used again. We might be doing them a big injustice when saying they did it to "escape" or avoid the suffering of the LB. It may rather be because the prophecies told them to, and they never go against "the current".

It's more than just idle thoughts, because I'm wondering if the Aiel/Tinkers (there's an awful big lot of them - a remnant of a remnant means a huge lot of people dying...) have not been similarly chosen by the Wheel to be a sacrificial lamb to balance the closing of the Bore. It's a very strange coincidence that two identified da'shain branches of three have to disappear from the Pattern, one when the Taint was undone, one likely when the Bore will be closed. If we follow that logic of "balance", the Breaking was the price paid to let the Wheel be able to adapt the Pattern to include the temporary sealing. Of course, this is also how ta'veren works. The Wheel need ta'veren to be able to achieve "macro changes", but there's a big lot of side effects around them to balance it out.