Justice
He stood surrounded by Lord Tuor and his men of the White Wing on the parrapet of the south wall of the city. Maeglin did not cower before them, nor did he seem remorseful about what he'd done. Gondolin was burning, the king dead, and the people scattered: either escaped or lost. The traitor's men of the Mole lay dead in their own blood. All that was left to do was see justice done to the betrayer of Turgon's hidden city. Tuor nodded to his lieutenants and they picked Maeglin up and threw him over the wall.
Justice was done.