You're showing what would represent like .1-.2 percent of the voter base behind Trump. Then calling that "half". KKK has been shamed into almost oblivion - less than 10 thousand people nation wide. Toss in the other fringe groups that are similar to the KKK and you have around 17,000 people.
71,000,000 votes last election - 17,000 people. Let's assume all 17,000 of those folks voted Trump. So 70,983,000 / 17,000.