Why are managers hesitant to give constructive feedback to employees--especially when there are difficult issues to address? Some managers just don't know how to have a crucial conversation with an employee and have a successful resolution without straining the relationship.
But I also think there is another dimension. How often have you hesitated to tell someone that his/her shirt collar is turned up? Did you hesitate because you rationalized that you didn't want to "offend" the person? In reality, we are being unkind by not bring it to his/her attention. In reality, we often hestitate because we are uncomfortable giving the feedback. It makes us feel uncomfortable.
It is cowardly and selfish to not give an employee constructive feedback. (Paraphrased quote from Ralph Christensen, the Managing Director of the Human Resource Department for the Church.)
D&C 121:43 tells us we need to chasten people quickly and with specific examples, and then show "afterwards an increase of love toward him whom thou hast reproved, lest he esteem thee to be his enemy."