Pindar, is your position based on ideological and moral, or practical considerations? Both?

I argued, with the example of the failure of the League of nations in mind, that practical considerations should override moral objections in this respect. There should indeed be a platform for discussion between all parties that have a fundamental commitment to popular sovereignty and liberty.
Since not all countries in this world share that outlook, including some powerful ones, there should also be a platform for discussion that includes these countries too.
It undermines the legitimacy of the UN in principle, yes. But strategically? The hope is, that in the long run, as long as the UN accepts its own democratic ideals and principles, the spread of liberal democracy will benefit from the UN's function and institutions. Meanwhile helping towards avoiding major conflict and upholding a basic rule of law in international relations.