White people have a long and embarassingly awful track record for violence to non-whites. As one of the earliest explorers of the world, as white explorers "discovered" new places with non-white peoples, thinking themselves superior, fair and just treatment wasn't anything they thought well of.
Today, whites in the US are the majority by just a slim amount, and wont be within our lifetimes. This fact probably weighs heavily on many minds manifesting as a significant amount of animosity which when combined with a situational gripe can quickly become violence.
Bullshit. Caucasian aka ****** is still a mega majority according to the US Census. No one will catch up if they keep aborting their own at the current rate.
Your post is incorrect. You are just regurgitating bullshit. No other race is even close.
White alone, percent, 2013 (a) 77.7%

Black or African American alone, percent, 2013 (a) 13.2%

American Indian and Alaska Native alone, percent, 2013 (a) 1.2%

Asian alone, percent, 2013 (a) 5.3%

Native Hawaiian and Other Pacific Islander alone, percent, 2013 (a) 0.2%

Two or More Races, percent, 2013 2.4%

Hispanic or Latino, percent, 2013 (b) 17.1%

White alone, not Hispanic or Latino, percent, 2013 62.6%
USA QuickFacts from the US Census Bureau