Demon Slayer is all about grand emotions.
The show appeals to our most basic sense of justice, to fight evil despite our own fears in order to protect those we love.
The first episode starts off strong with some major drama setting things in motion. Even if it is a bit cliché, the resulting dynamic between brother and sister is very interesting. The main protagonist may be a bit one-dimensional, but the support cast is great and the Demon Slyer Corps is full of interesting characters, especially Kagaya and Rengoku. The chilling villain is a well-motivated and frightfully force of evil. The action and animation are also top notch, resulting in a good show that doesn't have too many flaws.
Demon Slayer espouses values like courage, friendship, family and acceptance, which is not only demonstrated in Tanjiro's relationship with his sister, but also Nezuko's reluctant acceptance by the Slayer Corps. The show goes to great lengths at humanizing its antagonists by showing that not all demons are evil and that you shouldn't judge a character merely by his external identity. After all, what counts is a person's character and their actions.
Gentle Tamayo for example is a skilled doctor that has saved many human lives, despite being a demon. The head of the spider family, Rui, just wants to have the family that he never had and does everything to keep his group together to the point of harming others. Even if Rui is evil, his zealotry is relatable and very human. So far, most demons seem to have turned evil because they are lacking or missing something that is very human, like Kyogai who just wanted to be recognized for something.
In many ways, Demon Slayer is the polar opposite of what is being shown in today's American entertainment. The protagonist has to work hard for his skills, to the point of almost breaking himself. Family bonds and friendship are valued above all. Most importantly, identity is deconstructed and plays a secondary role to a character's actions and principles.
Demon Slayer is proof that its core message and principles are what the American audience still craves. I love the show as many of its themes remind me of early Dragon Ball, where showing forgiveness and acceptance by turning your enemies into friends are important central aspects.