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The world is a huge toilet. He should have use that.
Something always needed to separate the noble from the common. Aristocracy means the rule of the "excellent", those who are better for reasons. This separation could manifest in superior morality, or at least the appearance of such (as Machiavelli wrote the prince at least has to look like a moral person - in case if he is not).
Ofc in this case the Portuguese traveller's interprets the customs for us, and who knows how was it in reality. Maybe he was aware the case of the samurai, and he wanted an explanation for that, and rationalized that the pleb had to have immoral behaviour (but in reality he wasn't a witness of the acts of the peasants, he just made that up).