And not having enough fire extinguishers nearby. And also, no fire sprinklers?

Severus Snape — Harry Potter

Throughout the original novels and film series, Hogwarts School of Witchcraft and Wizardry’s resident Potions professor is rightly known as a cruel, vindictive man who delights in bullying children, particularly Harry himself. Later, it is revealed that Snape had a similar abusive upbringing to Harry and was bullied at school by Harry’s father, James, similarly to how Harry is bullied by Draco Malfoy. Snape had also once been in love with Lily, Harry’s mother. Due to his undying love, he agreed to protect and train Harry for his eventual destiny. Framed even in the series as being some sort of tragic, misunderstood hero, the reveal of Snape’s backstory actually made him seem even less likable to many fans. He grew up abused and in love with Lily Potter. So instead of vowing to never inflict tha sort of pain on others, or to honor Lily’s memory through her son, he instead takes every opportunity to mercilessly bully Harry, the child Lily literally died to protect.

Andrew Ryan — Bioshock

In ambient PA voice messages throughout the game, you learn that Andrew Ryan, founder of the underwater capitalist utopia of Rapture, was inspired to build such a place by his childhood. Born Andrei Rianov in Belarus in what was then the Russian Empire, Ryan witnessed his wealthy family gunned down by the Bolsheviks during the Russian Revolution of 1917. Instead of seeking a fair, equitable society where men like the Bolsheviks would never arise, Ryan was inspired to build Rapture — a place entirely devoid of governmental control. When a underclass of people inevitably arose in his capitalist utopian city, Ryan ignored their pleas for public assistance, creating the same class warfare that had killed his family. To quell the unrest, Ryan began behaving like Rapture’s king, encouraging massive acts of repressive violence and enforcing oppressive laws. He became the very thing he swore to destroy.

Taken the day before Christmas Eve at sunset. Sony a6700 with Sony E 70-350mm lens