Part Four opens with the appearance of Svidrigailov to Raskolnikov. He will emerge as the epitome of the sensualist and the type of Ubermensch who is thoroughly and completely interested in the gratification of his own appetites and desires and in the assertion of his own will. He has no qualms about his activities and depends on no one. He uses his intellect only so as to aid him in obtaining sensual pleasures. In a restricted nineteenth century society, he openly discusses his sexual pleasures in a manner that identifies him as being depraved and unprincipled.
Therefore, Raskolnikov rejects his request to see Dunya because he fears this aspect of Svidrigailov and thinks that the man still has ulterior motives and designs upon Dunya. Even though Svidrigailov says that he wants to give Dunya 10,000 rubles (in today's spending value, at least fifty thousand dollars or considerably more) so that she will not have to marry Luzhin, and even though Raskolnikov believes that she is marrying Luzhin only for money, he still refuses Svidrigailov's offer of help. The mere fact that Svidrigailov makes the same point about Dunya's marriage that he had previously made, he is still offended that someone else, especially such a sensualist and vulgarian as Svidrigailov, would make that point.
Svidrigailov's repeated emphasis that there is something in common between him and Raskolnikov repulses Raskolnikov; but still he does recognize some type of affinity toward Svidrigailov, especially since the latter has made the identical point about Dunya's marriage that he had made earlier. But more centrally, the thing in common is that both men will try to assert their own will above that of others, and this aspect of the Ubermensch aligns them.
