What about people who suffer trauma, childhood or otherwise, due to the decisions of others? Saying people's lives are strictly in their control is just not true.
Help is available for mental issues from psychological trauma. Even self-help, there is endless material freely available.
For mental issues from physical trauma, like a brain injury, I qualified my statement with being of "sound mind". I feel immense empathy for such people.
I'm bringing this up because you said people's lives are the sum of their actions.
I think we both agree psychological trauma can affect people immensely. However, your statement saying they can just go get help is really hand-wavy and oversimplifies the situation.
People who suffer trauma during childhood can have impaired brain development, stunted emotional development, poor executive decision making, and are way more likely to enter situations that retraumatize them -- causing more damage.
Simply saying "I will not be a victim" isn't really a thing. You adapt to the trauma by learning coping skills that are not healthy. When this happens in childhood, it is baked into your personality and then later in life you are left wondering which parts of you are really "you" and which are just maladaptive coping. Thus, the sum of you isn't due to just your decisions.
I speak from personal experience on this. I've never had a victim mentality. But now, at 35, going to therapy for cPTSD, I look at the young child I was and can truly see I was a victim. Does this mean I go around now saying I am a victim? No. But, realizing that I was in the past allows me to show more understanding and sympathy for myself.