Is Columbus worse that Isis? It's a odd question, If you go by track record(assuming we're speaking about ISIS in recent times only, and not attaching the history of Islamic extremist to them) than Columbus probably wins. However, Columbus was committing atrocities in an environment were he had no constraints placed on him. There was nothing preventing him from acting out his desires too their fullest potential. In the case of ISIS, there are constraints being put on them, which prevent them from reaching the state of power that Columbus had in the new world. In other words, ISIS can't just freely terrorize the West without some cost to themselves. So comparing their actions to Columbus seems like comparing apples to oranges imo.