I've been asked to explain why I'd propose that my own daughter be expelled from school for hypothetically throwing scissors across a classroom.
My daughter knows that scissors are dangerous and is careful at home with them because she knows that they could potentially harm her one year old sister. So, if she threw them at school, she would only be doing it out of calculated malice and if she was acting out of calculated malice at school (a thing she doesn't do at home) I would conclude that school was the wrong place for her.
Would I home educate her? Yes.
For how long?
Firstly I would talk to the school and find out if they could explain her behaviour. And, depending on how necessary it was I would have her assessed by a psychologist. For my daughter this would be extremely out of character.
But I think the topic arose in regard to one boy with behavioural problems who had thrown a pair of scissors across a classroom. Since this is not my child I can not comment on the circumstances. But I would not be happy to have my child educated alongside such a child. And unless they were segregated I would remove my daughter.