You could say that about any law, not just “international”.
Look at how laws are applied in your country and you’ll probably find them disproportionately applied against the poor over the rich.
We can’t just set and forget laws. If you want them enforced justly, you need to be active in your political environment and elect people who will do that.
If you want international law applied to the US, you need to elect politicians who would be willing to push for sanctions against them until they comply.
Or if you’re American, vote for politicians who actually respect the international community.
There’s a lot of bad shit in our poop that isn’t in most wild animal shit.
Particularly transmissible diseases for other humans.