Rainbow Dash had to grow up with a single mother, because her abusive father molested her as a child and got caught for it. He put her down for being a little shit, and tried to intimidate her into submission, but she also started to love him because he made her feel good. Her family didn’t understand, so she sort of blames them for breaking them up and sending him away to jail forever, but she consciously blames him for abusing her and making her like that stuff. She doesn’t want to admit it, but with everypony saying she was better off, she still misses him.