It is valid to call out motivation and engage in discussion around it. It doesn’t invalidate the case being brought but too often people and the media like to frame the situation in terms of morality.

South Africa and the other countries that support the case are likely not (only?) taking a moral stance.

I, like OP and others, see these articles and wonder why this genocide but not that one. I think that’s the difference between a human view and a political one.