The second life lead to neither of those things. You act like that is what caused them, it didn't. That girl she pushed in the water bullied her when she tried to join the girls in the first place. The pencil to the hand was in class at school due to a boy smacking her ass. It is a misrepresentation to say dancing lead to either of those things. It would be like saying watching football lead to you getting into fight at school because some kid knocked your books out of your hands.I agree, and I don't intend to defend to morality of a fictional family in a movie I haven't seen. I'm contesting the suggestion that the family are the exclusive bad guys in a movie where the secret second life of dancing leads to stabbing and drowning.
Her actions were not due to the dancing, she was a kid who was acting out due to having family problems at home. If ANYTHING lead to those happening it was the lack of support structure in her home and the abuse she endured.