If the only benefit of space-based datacentres is a hedge against infrastructure attacks in a world war then we are in an awful place.
I'm not disagreeing with you but peace is far more prosperous for humanity than blowing the worlds' retirement funds on datacentres-in-space as a military endeavour.
Also. I would not fully trust argument that all possible adversaries are incapable of attacking them. Possibly with cascading effects at least when you get size of satellites planned.
