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(Odysseus:) 'Keep your joy in your heart, old dame; stop, do not raise up the cry. It is not piety to glory so over slain men. These were destroyed by the doom of the gods and their own hard actions […].' (22.411-413)
You have to draw the line somewhere. It's just to mercilessly slaughter the suitors, but it's not just to gloat about it. The fact that it's just is actually what makes gloating wrong.
(Athene:) 'Hold back, men of Ithaka, from the wearisome fighting, so that most soon, and without blood, you can settle everything.' (24.531-532)
Oh, sure. Now that Athene's got what she wants, she's ready to stop fighting. When her precious Odysseus is the one being threatened, she suggests that maybe they should stop taking revenge on each other and start thinking about new ways to find justice.