I was at the Na Nach [Breslov] place today and they were learning the LeM vol. I:106 where Rav Nahman goes into the idea that "all poorness is from the mind," [small mindedness].  And there he also brings the idea of teaching and rebuke.  So even though there is a definite aspect of not to rebuke others as you see in LeM vol. II:8 still there is a time a place where it is proper.   [LeM II:8 starts out with: "Even though rebuke is important, still not everyone is fit to rebuke, since by rebuke one can make things worse."]