I think you're missing the point.
The idea is more that avoiding a victim mentality typically leads to better outcomes. This isn't a surefire guarantee, but statistically, it tends to yield more favorable results.
E.g if we plot the range of outcomes for two groups of people, one group embracing a victim mentality and the other not, we'd likely see two power-law curves. However, the curve representing those without a victim mentality would generally trend higher, indicating more positive outcomes.
Applying this to your specific case, if your parents had embraced a victim mentality, there's a likelihood that they would have experienced less success, happiness, etc.
E.g if we plot the range of outcomes for two groups of people, one group embracing a victim mentality and the other not, we'd likely see two power-law curves. However, the curve representing those without a victim mentality would generally trend higher, indicating more positive outcomes.
Applying this to your specific case, if your parents had embraced a victim mentality, there's a likelihood that they would have experienced less success, happiness, etc.