From the background introduction of the characters, it seems that Tania and Danning Love are a kind of person, educated, but not good at using guns, or facing scenes such as sniper duels. But perhaps it was nature, or perhaps because of the experience of her parents being killed by the German army mentioned in the play, what made her actually value not the good education she had received, but what Vasily had. Even she would not like the work arrangement that Danning Love helped her to do with the mentality that he only wanted to protect himself. A lot of details in the movie show this, so this love is actually very reasonable.
But Danning Love is also quite wrong. He himself was quite right, "different people suit different things". His character and abilities are just different from Vasily's, and his assessment of himself is accurate. But he also believes that he and Tania are both born to contribute their own value from the text. Thinking that Tania is the same person as him, and entangled in this obsession, led to the eventual tragedy of Denning Love. If he had to blame it, maybe it was only the lack of new hope on the battlefield to make him give up on this one.
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