User blog comment:G-Monster/Pure Evil Proposal: Jeremiah Valeska/@comment-26833018-20190514220359/@comment-26833018-20190514224215

I’ve always thought the point of the toxin was to twist his morality. Jerome wanted Jeremiah to be his successor since he believed his brother to as crazy as himself, or more so. However, despite his madness, Jeremiah had more of a conscience than Jerome and didn’t want to be like him. So Jerome used the toxin to make Jeremiah more villainous.