My auntie does tarot cards. Not seriously, she doesn't do it on the general public, but she's done courses in it just for fun. I personally don't believe them, but what's happened to your mum is quite disturbing. I agree with you that they shouldn't be used, because even if nothing does happen, the fact that someone else has predicted yuour future could make you act differently. For example, now your mum believes she's going to be in a car crash, she'll possibly stop driving which could affect her job, lifestyle or whatever.