A Debate Question: When you surrender your brain to someone else, can logic get thrown out the window?

Umar ibn al-Khattab (580-644), the second Caliph, came to kiss the Black Stone, he said in front of all assembled: "No doubt, I know that you are a stone and can neither harm anyone nor benefit anyone. Had I not seen Allah's Messenger (Muhammad) kissing you, I would not have kissed you." (Sahih Bukhari 1494) Now what precisely did Muhammad gain from kissing a rock?