The last several shooters have been white, granted, but they were all mentally ill too. Let's face it, rational, stable individuals, white, black or otherwise, do not kill because of their race. The kill because of the evil going on in their heads.
The Unabomber was white but I heard no outcry back then to stop "white terrorism". The guy was a brilliant nutcase. White had nothing to do with his bombs.
Until everyone stops inserting race and racism into every aspect of our lives, we will never be free of racism. It is being foisted upon us everyday by people with an agenda.
The ones before that were mostly Muslim terrorists but if we pointed that out, we were told we can't make the connection between Muslims and terrorism.
We can, however, blame "White Terrorism".