A hammer or steel bar, on the other hand, is not immediately threatening because for the most part they aren't used to harm people.
I was walking behind a guy this weekend and noticed a Glock sticking out of the back of his pants. It's a little unnerving that one would just stroll around with a weapon that can do so much damage, so easily, in such a casual way.
As a Canadian living in the US, I don't think I will ever get used to the sight of casually toting around guns on the street - particularly when it's just tucked into your waistband.