Can you explain why fan boys would be "bad" for Google? A healthy dose of cynicism/skepticism is healthy for innovation, and the term 'fan boy' suggests to me

Can you explain why fan boys would be "bad" for Google? A healthy dose of cynicism/skepticism is healthy for innovation, and the term 'fan boy' suggests to me a level of zealotry that's at least slightly abandoned rational thinking for emotion. I don't want to hire anyone who thinks everything we do is perfect, what will they fix!?