Two thirty year old men are brutally killed in identical circumstances
One is White
One is Black
You could not in a million years come out with a Pre-declared Law saying the death of either warrants a longer sentence than the other. You would get haranged and abused by every Civil Rights and activist group on the planet.
Why on Gods Earth should the occupation you chose make this any different?
Whats next - Murder of Policemen = Life Imprisonment, Murder of Politicians = minimum of 30 years, rest of Joe Public = 10 years in prison / out in five for good behaviour?