An added benefit of South Africa's ICJ case against Israel is you can ask libs "well if we're so serious about this, where's the U.S. ICJ case against China?"

It's not a perfect argument, but it does tease out stuff like the U.S. not really giving a shit about international law, the U.S. not actually believing there's a genocide in Xinjiang, a bunch of other countries not believing it either, etc.