Shouldn't Americans be concerned with Ku Klux Klan?

They are cowards hiding behind their dingy linen (sheet and pillowcases. They strike/hit/attack in groups while people are helpless or unarmed then they run like cowards. They will never challege anyone face to face, knuckle to knuckle, knock down dragg out. They talk tough because the law will protect them of their evil doings. They target (pick on) Black people in the U.S (only) because they feel they are the weakest. There are a lot of other minorities (other than Blacks) in the US, such as Mexicans, Asians, and etc who the white supremacy groups will never attack. Mexico or Asia will take their little @sses out before they know it. If you notice, "it's only the Black people" they target. The US will never be pure white no matter how these racist group talk noise and make threats, to Black only. No other nationalites pay these cowards any attention because they know those cowards aren't going to attack them, like they do the Blacks.