Love or Indifference?

Generally, those who embrace other Jews regardless of their religious observance and do not critique their lifestyles are considered to be authentic practitioners of ahavas yisrael, love of fellow Jews.  In contrast, those who critique the lifestyles of others are considered to lack the quality of ahavas yisrael.  But doesn't real love of fellow Jews motivate one to ensure that their decisions are in their best interests?  Doesn't the lack of critique demonstrate a lack of concern?