You want to tell poor people to take responsibility for their own success, because that's the best way to motivate them.

But you also want to tell those running things that they have a huge impact on poor people's success, and things like better public schools would go a long way. Because if the people running things shrug and say "those poor people are responsible for their own success" then systemic inequalities will persist way longer than they do in places like, say, Finland that have widespread, high quality public education.