I want to hit my dad
Why do you want to hit your dad?
Just because I feel like doing it in the moment.
You aren't suppose to hit your parents. You are supposed to respect your parents. You shouldn't hit people just because you feel like it.
Why can't I hit him? You are a bad person.
Sometimes the relationship with one's parents can be difficult but you shouldn't hit your parents. It won't resolve the issue you are having with your parents and it will make things worse. They could also hit you back.