Dunno if this is helpful or not, but it's been rattling around in my head, so might as well share it and see what people think: as anyone with a basic knowledge of Judaism will be aware, one of the most important Jewish festivals is Pesach, which celebrates the story of the liberation of the Jews from Egypt. Fwiw, it's also one of the more popular festivals with like liberation/progressive/reclaiming tradition Jewish types cos of being about freedom and overthrowing the oppressors and all that. As you'll also probably be aware, the Passover story involves the Ten Plagues, culminating in the slaughter of the firstborn*.
So, looking at the Passover myth as it's told, we can accurately say that one of the most important Jewish festivals, Pesach, celebrates the killing of children. I also think that that statement would be an incredibly unhelpful and counterproductive one to make in like at least 99.9% of possible conversations.
And it might be possible to make an argument that talking about Mohammad's marriage to Aisha should be held to a different standard than talking about the um, bloodthirsty nature of certain aspects of Jewish myth, like if it's used to justify present-day practices more then it makes it more relevant. That might be true, or true in some cases, idk. But that's what I've been thinking about, anyway.
*to be strictly fair to Pesach here, I should acknowledge that it's ambivalent on the plagues themselves cos you're meant to spill a drop of wine and that. But I think it's also fair to say that the festival as a whole is a celebratory one overall, and that there are parts of it that seem to specifically celebrate the vengeance against the Egyptians,
Dayenu for instance.