 Hell is a place that was prepared for the devil and his angels, but ultimately is the destination of those who want nothing to do with God. The only reason anyone could be offended by the idea of the existence of hell is simply because they're not offended enough by the idea of sin. We don't understand truly how evil, how wicked, how dark sin is, and because we don't understand how sin violates the holy nature of God, we become offended by the existence of hell.