I feel like when people emphasize Akechi's murders, they often act like his motivation only boils down to "daddy issues" or they really make light of the impacts societal discrimination can have on a person. "But Futaba didn't end up like Akechi," I've seen people say, but the thing is, Akechi is meant to show the worst case scenario. Someone without anyone left to uplift him, to ground him, and to give him a reason to be better. Futaba had Sojiro, though that hardly justifies her mother's death, nor the horrible mistreatment from her relatives or what Shido put her through by framing Wakaba's death as a suicide. Futaba was in a very dark place, and she needed a helping hand. The Phantom Thieves saved her. But Akechi didn't have that helping hand when he needed it most. He lost his mother at a very young age, endured the foster system, never finding a new forever home, and at his absolute lowest point, was granted power he didn't understand with no one to guide him, and wanted to get close to Shido to one day backstab him and give him a taste of his own medicine. The murders came later, when Shido "instructed him." And given the way Shido yells at Akechi about what happens to people who cross him, and given what he did to Futaba (the men in suits), his cleaner, and how many people he had on his side, on top of Sojiro making it very clear how cutthroat Shido was to his enemies... Akechi was screwed no matter what. His face, his name, all of it could be used to ruin him in the real world. Alone, he would not have been enough to go through Shido's Palace, given how much trouble the Phantom Thieves had as a group. Plus, y'know, this:
Something so many people ignore when they talk about Akechi and his murders and ignore everything else the narrative tries to say about him.
What P5 tries to say about Akechi is so important to its core themes. That, if Akechi hadn't been a victim of so much injustice, he might have never gone to such lengths. That doesn't undo the damage he's done, but it's so important to understanding why the game approaches him with sympathy rather than writing him off as pure evil. Because it didn't have to be this way. If he had just met Joker sooner, if he had just had somebody. Akechi represents what can happen to vulnerable children who are failed by systems meant to uphold justice and other ideals, and how those who have nothing, who have only ever been hurt, are far more likely to lash out in turn. Persona 5 places so much importance on the suffering of children and the ways society needs to improve for the sake of children. That, I think, is one of the key reasons Akechi is framed as a victim. He is a warning, a cry to do better.