“Arithmancy” is their name for math classes and is mentioned several times throughout the books. It is one of Hermione’s favorite subjects.
At one point, the real world evil witch that is JK Rowling suggested that Arithmancy is like dviniation, but with math, saying they use numbers to predict the future. I take this to mean that the wizarding community discovered calculus independently from the rest of the world and mistook it for a new form of magic.
But it is possible to recover, and many do. There is no recovery from being murdered. Personally, I’m glad I’m still alive even if I’m still dealing with my own SA-induced trauma 20 years later.
Murder also has further externalities. When you kill someone, you take them away from their friends and families, who now have to live forever without that person in their lives.
But this whole conversation feels a lot like we’re asking “who was worse, Hitler or Genghis Khan?”, and it’s weird to put either side on the defensive even if there is an objectively true answer to be found.