Black guy kills some people.
Society: Criminal.

Muslim guy kills some people.
Society: Terrorist.

Latino guy kills some people.
Society: Criminal.

White guy kills some people.
Society: Mental illness. (lost soul, complicated psyche, quiet loner, misunderstood, frustrated with life, experienced recent, traumatic, life-altering events that set him off; not to mention all the positive descriptors that are attached to him, i.e. intelligent, PhD candidate, honor roll student, etc.)