What I was trying to say is that he had to enlave the world, to keep it from becoming chaotic, in order to STOP Ruin, not because Ruin was influencing him. I think that because the Lord Ruler kept the whole world stable, and kept chaos at bay, Ruin's power significantly weakened, and Preservation's would have strengthened. That's why he said must, according to him, he msut kill these rebels in order to keep the peace and keep Ruin at bay. This would explain why Ruin was still able to influence a few select hemalurgist: Zane and Vin's mom,. while the lord ruler was in power. No matter how powerful the lord ruler was, he couldn't quash all the chaos of the land, unless he killed every human on the planet (remember the humans are of ruin comment?). So he did the best he could, making a single, unified empire of man, so there would be no more chaotic war, and ruling these poeple with an iron fist, to ensure order, thus preventing Ruin from inlfuencing all but a select few.