Srimad Bhagavatam: Canto 04, Chapter 11 – Svayambhuva Manu Advises Dhruva Maharaja to Stop

05. Dhruva was asked to stop killing the Yaksas because

a)   The fault was of only 1 Yaksa and mercilessly others were been killed
b)   Dhruva was a pure devotee and need to be exemplary in his behavior and character
c)   Lord is very much satisfied with His devotee when the  devotee greets other people with tolerance , mercy, friendship and equality
d)   All the above