I've carried a pocket knife everyday since the age of five. I actually found my
first knife (and old rusty thing, that my Father replaced with a new pocket
knife as long as I discarded that old thing before I ended up with Tetanus and
Lock-Jaw). For the last 1/2 of my life, I've actually carried two knives (as tools)
daily....a small locking pocket knife and a larger lock-folding belt knife.
I've an older Brother that, as a diesel mechanic working alone in a shop, had a
motor turn over pinning his hand between a belt and a pulley with his feet dangling
about three feet above the floor. It took him about three hours, but he eventually
managed to saw through that belt with the edge of a screwdriver to free himself.
This Brother of mine also carries at least one knife at all times. When this
happened to my Brother is the time where I began carrying a second larger
lock-folding belt knife.
Over the coarse of our lives, we've both managed to not only not stick a knife
into any of our fellow men, but to never so much as threaten another with a knife.
They're a tool that every person should carry that can save your life, or the life of
another.
Personally, I have no issue with a Sikh carrying a Kirpan at all times, as I do
something similar myself (though for different reasons) following my own belief
system. My issue comes from one segment of society (be it based on race or
religion or what have you) being granted privileges that are not only excluded
from the rest of the population....but makes the rest of society criminals if they
exercise the same right granted to a few.
I'm sure the argument can be made (strawman style) using some other item
that a few members of society would carry that the rest wouldn't be interested
in bothering with and plugging it into the place of a useful item like a knife that
we all should carry...but this is my position on this issue.