David sins with Bathsheeba, god kills the baby as punishment. In fact, the bible he struck it a blow and that it suffered for a week prior to dying. WT says this was a loving thing to do since David was worthy of death, lovingly god spared him. Screw the child though.
WT even went so far as to say that David and Bathsheba no special right to the child, and because of sin, the child had no special right to life, either, and thus God could justly kill the child...talk about sick...since that reasoning could be used to kill practically anyone.
Why does he do it? He's got some anger issues, I would guess. If you look at it, he does an awful lot of murder, genocide, more murder, more genocide, mass near-extinction-level event, more murder, then a soon-to-come unequaled mass murder that will make Hitler look like Mother Theresa.
Maybe he's just looking forward to a number of Awkward Resurrection Moments. Hey David! Here's Uriah! Better make sure he doesn't read 2 Samuel...this time without arranging his death, will ya? I'm assuming Lot sobered up enough to figure out what his daughters did to him, but that's still going to be awkward...[Lot reading Genesis] "Oh, man, you mean, like, EVERYBODY knows about this?"
--sd-7