Checkmite
Skepticifimisticalationist
One good example would be Wal Mart. Wal Mart has been sued repeatedly for stealing employees' earned overtime by editing their hours worked records. (They've been sued for a lot of other bad acts, but I'm focusing on this one for illustration.) They most of the time offer a settlement on the condition that the record be sealed. This permits them to use the legal system to hide evidence of repetitive, deliberate lawbreaking on the part of Wal Mart from future plantiffs, who have to build their cases from scratch every time.
But Wal Mart isn't using the legal system to hide the evidence. If they've settled, then the matter was handled outside of court. You're confusing a settlement with a judgment.
As I said, when two parties settle, the only thing that happens in court is that the plaintiff withdraws the lawsuit he filed. The civil court cannot compel a plaintiff to explain or justify doing so; as the party asking for justice, withdrawing a lawsuit is a plaintiff's protected right. The court most certainly cannot force a plaintiff to pursue a lawsuit they voluntarily wish to withdraw, nor can they force a plaintiff to give a public reason for deciding to withdraw their complaint.
As the plaintiffs, the shafted Wal Mart employees have a right to reject any proposed out-of-court settlement and continue to pursue the lawsuit through to a judgment. They also have a right to withdraw their lawsuit at any time for any reason, including an agreement they happened to reach with the defendant outside of court.
Besides, from a strictly legal standpoint justice is done by Wal Mart's settlements anyway; the suing employees likely receive all the money they're owed plus a hefty additional sum as compensation. As the injured parties, if they're okay with that, and choose not to pursue any further damages against Wal Mart, who is the court to tell them they're wrong?