The kingdom is within. It's because they are in hell and too afraid to face their own demons that they inflict hell on others. They project their sins (demons) on others because they are too fragile, it's too painful to look deeply and honestly at self, as do most of the rest of us, to greater or lesser degrees. That's why the Great Merkavist, Magician, Healer, Almighty said to bless those who curse you and pray for those who persecute you. And why, as he hung on the cross, in the death throes of the most brutal torture imaginable, his torturers told him to heal himself. We don't see our own shadows, but in someone else, until we get super honest, and, as AA says, take a fearless and searching moral inventory of ourselves. Because as long as our gaze is outward, we're not bothered by the occasional inward accidental glimpse.