The most fascinating part of this film is the fans' hatred for Paul...
It seems a curious part of human nature that people are so quick to play Devil's Advocate. It's also quite interesting that, no matter how corrupt an individual is, people will generally feel sorry for them if they're given enough time to tell their side of the story. In case it isn't obvious, MAJOR SPOILERS ahead.
In this film, Frankenstein is a thoroughly wicked man. He murders to further his experiments and to cover up an illicit affair which results in the mistress becoming pregnant with his child. He's also shown to care very little for Elizabeth whom he neglects, cheats on, and endangers. Their relationship is essentially loveless, as it is an arranged marriage, and he treats her as little more than property.
Yet, the audience is prone to hate Paul for standing in the crazed doctor's way, "stealing" his fiancee, and "betraying" him. While it's clear that he cares more for Elizabeth than Frankenstein ever will, he puts their happiness ahead of his own. In his loyalty to his friend, Paul refuses to turn Victor in after two murders and only abandons him after becoming convinced that the doctor will continue to put Elizabeth in harm's way. Yet, the audience can't help but view things from Victor's perspective. They feel a sense of betrayal on the on a part of someone who is supposed to be there for them and they see that person as having stolen away with someone who belongs to them.
It kinda makes me think of the individuals who harbor oppositional views toward Jonathan and Van Helsing for coming between Dracula and Mina. Although I really don't think that this response was the intended one on the part of the film makers, it really highlights the way that the movie sold people on Frankenstein's views and perspective. They hate whom they should support and support whom they should hate all because of whose perspective we see the story from. To the villain, the hero is the antagonist.
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"In literature, it's called plagiarism. In the movies, it's homage" ~ Roger Ebert