That’s a very simplistic description of the KKK’s mission and reason for existence. They are certainly white supremacists, but they are also Christian extremists who are anti-Semitic, anti-Catholic, anti-immigration, etc, etc, etc. Burning crosses isn’t an act of racism; in the KKK’s twisted belief system, they are ignited as a show of faith. The KKK’s violent racism doesn’t disqualify them from also being religious extremists and terrorists. They are all of those things.