Should a person study mindsets before philosophy?

In a prior radio show, you said that adopting a rational philosophy like Objectivism is not a guarantee of rationality and other virtues in practice, but appears more to be a kind of "moral amplifier." If I remember correctly, you said that studying and adopting that philosophy will make a person morally better or morally worse depending upon whether that person has a "fixed mindset" or a "growth mindset" about ethics. So if someone has a fixed mindset and embraces Objectivism, that person may not act rationally or decently: he will tend to use the philosophy to beat other people over the head with (often unwarranted) moral judgments and commands. By contrast, a person with a growth mindset who embraces Objectivism will tend to focus on applying that philosophy to improving his own life, while acknowledging and correcting mistakes along the way. If being able to apply rational philosophy to life properly is contingent upon having a growth mindset, does that mean that before even learning that philosophy, a person should work on developing a growth mindset? Does that mean that until a person feels reasonably confident that he has a growth mindset, he should refrain from studying rational philosophy? If learning rational philosophy is valuable only insofar as a person holds a growth mindset, does that mean that the distinction between fixed mindsets and growth mindsets is more important or fundamental than philosophy? Or it is an aspect of philosophy?