Academy of Sciences of Heroesland

Is there anything in Rasputin's biography that Boney M sings about?

Yes.I reviewed the textbook and a couple of reference books. It only states that he "had unlimited influence on the Tsarina."

whether it be a knight, a samurai, or a gentleman

I have no idea about samurai, but the intelligentsia of the nineteenth century (especially the early part) perfectly understood what honor was. This is evidenced by the rather casual attitude of writers of that time towards its manifestations, as if it were something self-evident (as in Pushkin: Tatyana refuses Onegin without hesitation, it is written as if another answer is theoretically impossible).
Since the intelligentsia at that time dictated fashion to all other strata of the population, they had to, willingly or unwillingly, conform to that level in some way. And now, the fashion is dictated by the rest, let's call them that.
Quoting writers and poets of the Romantic era does not confirm the absence of depravity at that time. It seems that your favorite writer is Dostoevsky? He is closer to the truth, although one should not judge a society of any period solely by fiction.