The appropriate tact lies somewhere between the two extremes. One should be in control of his emotions, or tactful in offering his opinions on matters, but at the same time not above acknowledging either.
At a philosophical level, I've always believed no topic is off the table. I was nosy enough to want to talk with deputies of various backgrounds to see what made them tick. Gays, lesbians, self-professed leftists and rightists, geeks and alphas, Christians and atheists—if they wore a badge, I wanted to know where they were coming from. As such, they have all entertained nosy-assed questions from me.
In a bid to foster candid conversation, I often opened up myself, as well—it was that whole quid pro quo thing. How the hell else was I supposed to know how people thought and what was important to them? How the hell else were they to know what to reasonably expect of me when it came to dealing with sensitive matters?
Briefing sessions touched on just about everything under the sun that I felt could impact a deputy's career, and if I thought a policy was b.s., I said so.
Speaking out against department policy was tantamount to heresy, and definitely out of sync with what the Supervisory Leadership Institute (SLI) taught. But I was hardly the first to do so, having been seduced into such candor by the precedence of those I'd respected throughout my career who'd been equally truthful in their occasional descent. They didn't check to see which way the wind was blowing before taking a stand, and if the emperor was standing starkers, they let him know it.