First of all, it wasn't rejected. Several noticeable distros included it to their repos or began testing. And the reason Void Linux yet hasn't, is that the team isn't sure about Xlibre's longevity.

I see no reason in cancelling XLibre due to developer's political views. It's free and open source, that's it. Enrico Weigelt gets nothing for working on it. Furthermore, it is good that he's making XLibre. He's doing something safe and useful. He could've become a political bloger or activist and influence minds instead of coding. Now ask yourself, if this would be better than maintaining an obscure fork of a deprecated piece of software, which is hardly going to ever be adopted in security-sensitive environments (because they are on distros with Wayland already).