Visit to Earth 1483AD (Dedicated to the Closed Minds of Earth)
After travelling 3000 light years in a matter of hours the chief alien is baffled to be told by his advisor that the local earth dwellers think wearing clothes is mandatory and that whereas male nipples are acceptable female nipples are rude. Clearly a primitive species, he selects a male and three breeding females for the return journey and hence to the zoo of extraterrestrial species.
There is a hierarchy of proof. 1) Repeatable demonstrable experiments 2) Mathematics and Logic 3) Independently Corroborated Historic Records 4) Individual Observations. Not everything is capable of proof. However filling the unknown space with unsubstantiated things of your own choosing is pointless since such theories will reveal no insights on the real world. What would a belief in fairies enable you to do? Better to acknowledge the limits of your knowledge.
Unfortunately most people get brain washed by the time they are 5 according to some national or religious identity. Perversely beliefs which have no substance are accorded the greatest privileges of unquestioning obedience. Whereas the scientific method provides a means to persuade anyone regardless of background there is no means of ever persuading the correctness of religions. But it is not only religion, nationalism and political isms are just as bad.
I am not asking everyone to discard their identity just to recognise the distinction between the objective and subjective. Moslems don't have to eat bacon, English people don't have to eat horses or dogs but be tolerant of other people who want to. True toleration is not about no-one offending each other. Its about accepting that other people are entitled to views you don't like. Of course isms don't like free speech, they can repress but they can't win the argument.
Countless times I have been engaged in some debate with forum moderators over degrees of nudity. This is just a subjective cultural concept which has no objective meaning. The alien from outer space knows this already!