Because one does something out of hate and spite and isn’t a direct connection with a faith whilst the other murders people while chanting to their god.
Either you’re a liar or you’re just ignorant. The KKK is ABSOLUTELY a faith based organization. They fucking mention Christianity on their website header.
[image from www.kkk.com: “Bringing a mesage of hope and deliverance to white CHRISTIAN America!” ]
So how about you stop justifying the villainization of one of the world’s largest religions based on the actions of a tiny minority that is not representative of the faith.