An individual's demeaner and appearance will determine how authority reacts.
Exactly. If I'm attending an evening event in Center City, Philadelphia, I dress up for it. I may not wear a tie, but I will wear a sportcoat, decent shoes, etc. I try to "Dress For Success," as it were.
I could dress like a bum, but I'd increase my chances of being treated like a bum. I try to dress slightly better than most, carry myself in a classy way, and not act like an idiot.
On my side, I'm a tall, thin, geeky, nerd who's very nearsighted. I tip the scales at a whopping 130 pounds, so I don't look threatening. In fact, I've been told more than once I look like a somewhat undernourished FBI Agent. <img src="/images/graemlins/smile.gif" alt="" />
I make no apologies for what I carry. If someone spots my eyegoggles or particulate mask and questions them, I'd reply I thought it would be prudent to carry them after the bombings in London.
I also carry Wave or SwissTool, a small Swiss Army MiniChamp, and a Blade-Tech Mouse Light. Nothing that should get anyone overly excited.
-- Craig