It’s less they had to go because they didn’t suffer enough and more that they couldn’t cope with suffering and move on. The irony being that Venat suffered enough to take such a drastic action herself, showing that she was also unable to cope with it. Then she proceeded to spend entire millennia entirely alone to bear the weight of what she had done and inflicted on others, leaving her as the only one who actually had to cope with that suffering.

Well, her and the ascians she left alive.