You didn't judge me? Hint: when you say to me: "I bet people "like you" made excuses for slavery,.. "mock" Black Lives Matter or  Spare me your "fake" outrage... you "are" first stereotyping me, then based on your created/assume Stereotype, you are incorrectly Judging me as a person, on words or actions, I haven't said, done or believe.  
Your point, if someone kills with their car, with "intent" to kill, verses an accident with  no "intent", it is view & penalized differently.  I'm not saying she was right in doing it (I believe she didn't think through how her actions would be perceived by others, based on past history)  but her "intent" was not to purposely harm or "Mock an entire race for kicks", based on info provided. Thus I don't think she should be penalized as you described.
As your "intent" was not to Stereotype or Judge me, but you did, but I will accept your "intent" was to not, as you were just trying to make your point, that you feel strongly about. 
Good luck in life