The answer is yes.
I always have a few knives, except when I am in court or in the jail.
A while ago, I bought my kids toys at the big box store. I had to immediately go back in and return one that did not work. The customer service lady told me to go grab another. When I came back, she told me to take it out of the packaging and make sure it worked before leaving, so I did not have to return a third time.
I asked if she had any scissors or a razor knife to cut the package tape, and small zip ties holding the toy in. She said no.
So I took my own knife out (small 3 inch blade). She exclaimed "WOAH, that is a weapon!"
This is in a store that sells AR15's, machete's, axes, ammo, all sorts of knives.
Customer service was looking all around trying to find anything to open the package, and cut the ties!
The knife was hidden in my hand. I had my finger along the spine, and only a hint of edge showed while I cut the package open, and severed the ties holding the toy open.
One of my favorite questions is "why do you carry a knife".
This is often asked after the person seeks you to to borrow the knife to cut something, and they come looking for you, because they know you have a knife. I like to respond in the vein of "I've carried this knife for 23 years so that when you wandered on in here asking to borrow it, I would have a knife to lend you!...... I can die happy now."
I can't count the number of times I have had to lend some one my knife, or cut something for them when asked.
I don't run around whipping my knife out in public for no reason.
Another funny experience was at a large home improvement store. My father and I were looking for a microwave.
They had them on a big pallet all boxed, and shrink wrapped. We had 4 hard ware store employees patting their pockets, getting on their radio's asking if anyone had a knife to cut the wrap.
I took my knife out and cut it at a seam, and put the knife away before the guy could make it from 200 yards away, across the store. The manager was a life long friend, and she laughed at the employees who were wide eyed at the fact that I had a knife. She gave them a hard time that the 4 of them had to call some one else over to even cut shrink wrap. I noted that she had a pocket knife and a utility razor.