Shouldn’t that be a “oh well, sucks. but a sale is a sale” problem?

“A sale is a sale” works fine when both sides to the transaction are well-informed and acting for themselves. When you are selling assets for someone else’s benefit, you generally have extra obligations to them, because otherwise you don’t really have an incentive to achieve a good price. So courts do generally have some oversight over sale of the assets of a bankrupt estate, to ensure that the trustee is not short-changing creditors just to get the job done quickly.

A complicating factor here is that the Sandy Hook families (who as far as I know are the large majority of the creditors) also supported the sale.

The man with the gun to his head doesn’t have much of a choice if he wants to live. You, though, have a choice between criticising and defending the man with the gun, and you’re choosing to defend him.