Out of all of Batman's Robins, he failed Jason Todd the most tragically, but it's for that precise reason that Red Hood would actually make a surprisingly capable version of the Dark Knight. After Dick Grayson moved on from being Robin to become Nightwing, Batman needed a new sidekick. He eventually recruited Jason Todd after the boy was caught trying to steal the tires from the Batmobile. Sensing Jason's troubled side, Batman tried to focus his trauma and anger into vigilantism as had worked for Dick. But Bruce Wayne quickly realized that Jason was a very different kind of troubled youth. He struggled to contain Jason's bouts of violence, which originated from his traumatic and abusive childhood, and even suspected Jason of murder when he was Robin.
Given Jason's abusive past growing up, Batman made a grave error bringing the boy to horrific crime scenes. Batman could relate to children of trauma, but he didn't revisit this trauma on a nightly basis as a superhero. Bruce should have known that Jason needed time to process what he went through. Being around murder victims was not the best way for Jason to grow into a healthy hero. In fact, it probably drove Jason's erratic behavior and set him on the path to inevitably becoming the Red Hood.
Related: Red Hood's Dark Secret Reveals Why He Came Back as a Villain
But his time both as a child of abuse, then a criminal, and also a Robin means that Jason is uniquely suited to be Batman and nurture other children in his position. He understands better than any other Robin what it means to grow up with trauma and to have to relive that trauma every time he puts on the uniform. In fact, as the Red Hood, Jason has made it his personal mission to protect those that can't protect
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