Long ago in days where I used to be roaming the streets (say 15 years ago or so) I sometimes did carry Balisong knife along.
On one occassion I got a knive in my face by some "new" Dutchmen,
and I pulled mine (which was considerably bigger

I just gave it to a friend of mine present there though as it could only provoke the other guy stinging me. Luckily he put away the knive as well and we fought without stuff. Luckily I kicked his ass.

Since then though I really see no point as it only provokes more and since I really won't stab anyone ever I don't see the point.
It is more dangerous than helpful for me.