I carry a knife all the time. Many people do.
A gentleman should always carry a knife.
Why? They're incredibly useful tools.
Knives, in my opinion, are one of the most basic EDC items. For many, the decision to carry a knife marks a transition into the EDC mindset.
I'm not sure all the origins of the question, but many who ask seem to feel that a knife is principally a weapon. No, I don't carry a knife to stab people...
There's nothing "weird" or "wrong" about carrying a knife. There is, however, something weird in chastising what others carry.