[Q]: “O Shaykh! Do we warn against them without mentioning their good qualities for example, or do we mention their good qualities and their bad (qualities)?”
[A]: If you mention their good qualities, then you have called to them. No, do not mention their good qualities — mention the error which they are upon only. For you are not responsible for studying their deeds or evaluating their personalities. You are responsible for clarifying the error which they have in order that they may repent from it, and in order that others may be warned against them. As for if you were to mention their good qualities then they would say: “This is the one we desire.”
Source: Muqaddamah al-Naṣr al-ʿAzīz, pg. 8; transcribed from a tape recording of the third lesson from the lessons on Kitāb al-Tawḥīd which his Eminence delivered in the summer of the year 1413, in al-Tāʿif.