The funny thing is the Perez run actually addressed this somewhat, with many of the Olympians being dismissive about the Amazon project initially and eating all kinds of humble pie like Darkseid having tricked the Romans into worshipping different aspects of them and so giving them an identity crisis.
But Rebirth? Nooooo, Rebirth sees what it thinks is an essential element of Diana's story and goes oh SHIT, we can't make THAT too grimdark! We can't possibly let THAT be seen in anything but a positive light because Diana Is Love and we can't write her being a cheerful bringer of compassion when her dad is King Rape of Rape Mountain can we?!
And then I guess they realised the other Olympians aren't much better.
And that's why we got JLD quickly brushing over how mean they were to Hecate right before she came back, got revenge and died to some retarded OC villain just so-again, conveniently-the Olympians can be mysteriously gone from Olympus so readers don't have to dwell too long on how fucking awful Diana's extended family is.
Honestly, Darkseid and Grail were doing everyone a favor by eating all the Zeus demigods. Hell, I remember Grail mentioned one made people starve at her bidding.