Alan, I did not read where this guy's ethnicity was mentioned. From an outside observers point of view, your bringing this up does actually speak volumes about your own biases though.

As for terror, it's not the color, it's the intent. Yelling Allah Akbar let's everyone know he is doing this in the name of Islam. That is where we get the terrorism...it was his intent.

Another example of a mass killing is Dylann Roof in South Carolina. Was he a terrorist? No. He is a racist and killed because those folks were black.

While it's not always obvious what is and is not terrorism (the motive for the Vegas shooting is still unknown), sometimes it is. In this case, it seems rather clear.