white nationalist is a made up term to condemn white people that believe in their country. The purpose is to umbrella all whites under Supremist. It is a hate term by the left.
Both incidents are done by individual crazies. Neither should be used to label others. Anyone can bring up thousands of incidents where individual minorities did something evil and pert neer everyone will say you can't blame the group.
You can't help but be an apologist for racists. White Supremacists label themselves as White Nationalists, so it is not a term made up by the left. White Nationalists are racists. They want a nation that is white, Caucasian, Anglo-Saxon, Aryan, to the exclusion or subjugation of all others.
That being said, you can steep yourself in nationalism. You can have pride in being an citizen of the United States. You can be proud to be white. Those in themselves don't make you a racists.