4. Well historically the groups you cite have not received equal protection.
Sometimes it takes a little extra effort to overcome injustice. How many women were the victims of domestic violence and saw the perpetrator walk, or receive less than equitable sentencing for their crime if, as you say, the violence was no less immoral than if it had committed on a straight, white male?
Yes, in a perfect society ALL crimes of violence would be met with the same investigation, judicial process, and punishment. Sadly we have not yet achieved that perfection yet.