Brett points out that Athene gets called Justice and therefore might be inclined to punish the Amazons.
There are lots of different conceptions of justice, though. In The Odyssey, Athena seems to think it just for Odysseus and Telemachus to slay not only Penepole's suitors but also her haindmaidens, without inquiring too closely into whether they were all guilty of capital crimes against Ithaca's royal household. It may be that she judges men as collectively guilty of grave crimes against women and sees the raids as a small taste of retribution. I doubt that Diana would share this thinking, and if she brings back the Amazons, I feel confident that she'll find a way to stop the raids. But she's not her family's rightful judge, jury and executioner, and it 's not up to her to decide that their virtual genocide at Hera's hands is the rightful punishment for their alleged misdeeds
It's true that Wonder Woman didn't let Captain Nazi loose -- but she also didn't lop off his head or leave him under the influence of some non-judicially imposed death-like enchantment. She turned him over to the authorities --which could be trickier in the case of Hera or the Amazons. Would London or Virginia authorities want to risk the wrath of the gods to try to make a very difficult attempted murder case against Hera? Could they legally prove that Hera sent the centaurs? Would Libya's new government want to try an ex- and possibly future goddess for an obscure murderer committed over 90 years ago? And could anyone make murder charges stick against any of the Amazons for unwitnessed acts committed at least 30 years ago on the high seas? I think the world's main concern would be not punishment but prevention of future raids -- and Diana would share that concern.