Likewise, “everything is allowed” is the flip side of Nothing is allowed. In a world where all is equal, it is impossible to value anything. Being given no means of identifying and building a self is as absolutistic as being coerced into a social role and place. What could be worth doing, if all acts are equal to all other acts, and nobility a lie?
The deepest human needs are connection and a sense of meaning. We want to belong with others and we want to belong within ideas and shared words and images. This is how we balance our need for growth with our need for belonging.
Within the mythic universe of this game, the Assassins are more or less Satanists following the dictum “Do what thou will”, fighting an authoritarian Universal Church ( even if outwardly the Assassins are tacitly Islamic their creed clearly is not).
There are countless healthy ways to behave, countless solutions to the problems of meaning and belonging. The notion, though, that there is only one truth is very pernicious.
But, and here is my point, you have stayed in the same ideational and cultural space if you vehemently deny ALL truths. You become, actually, more stupid, and we see evidence of this everywhere.