The entire point of the image is that protecting and engaging any and every marginalized community is a fundamental part of healthy democratic institutions. And part of the iterative process of improving and strengthening our democracy involves seeking out opportunities for creating egality. There is no singular perfect state where you just stop - you always need to be looking within for opportunities to make things better.
Don’t think of it as just advocating for minority rights, think of it as advocating for human rights wherever that advocacy is needed.