I feel that this position, given reality, is not defensible and often say so in person and in print. I don't think so. Again, I think it is fair to say that five-sixths of the population, or at least that proportion of their representatives, feel that it is wrong to discriminate. It is often difficult to put aside one's own passions. Relying on persuasion, reason and debate rather than coercion to achieve our ends is a long drawn out process.
Libertarians say that obviousness is an objective notion.
What is obvious, at least to libertarians, is that MY freedom depends critically upon YOUR freedom. MY sense of responsibility is augmented by and dependant upon yours. The only way for me NOT to impinge upon your freedom is to slowly and painstakingly win you over to my point of view, without resorting to force, either mine or my government's. I'll accept universality as meaning five-sixths of my fellow humans agree with me. In the absence of such agreement, I will withhold judgement.