If the gambler is but a slave to their lizard brain, then isn't the murderer too? Surely no-one sits down and performs calculus and determines "I will gamble" or "I will murder", they both come from an impairment of our higher senses of reasoning by our baser instincts of rage or pleasure.
I'm obviously not advocating for murder, to be clear. But maybe if we better understand our position philosophically, maybe we'll end up with less brutal prisons ("they're not in here because they are ontologically evil, but because their hardware predisposes them to harm others and we have to contain them for the good of the many") and more sympathetic/realistic laws that focus on controlling harm and are less caught up in vague notions of "freedom" (the freedom to have your hardware bugs exploited by gambling companies?) that are too shallow in the face of a better philosophical understanding of what free will and agency look like for creatures whose programming is primarily informed by a billion years of evolution to crave orgasms and sugar.