By standing in our way, the only thing he did was make it so that the Minfilia's sacrifice was for nothing. He tried to kill the worlds best hope because he was weak himself. To me that is not compelling, just cowardly. He knew what Vauthry was doing. He knew he controlled the Sin Eaters. How many little girls, boys, men, women did he let die for nothing? He then has the audacity to say his final words "My girls... There you are...". He betrayed them all.