I question whether Clyntahn could bleed Haven white given that the bottleneck for his army is the weapons, not warm bodies. If the HoGaA is lost in spectacular fashion I doubt the CoGA could rebuild all the lost weapons given their dire financial position.
That said I am of the position that another atrocity is likely to be unavoidable given the way Clyntahn has consolidated power. I would prefer that he did it to his own people in the Temple or Zion due to his paranoia.