Wow, it sounds like some of you should be carrying better knives! I doubt he would have even come close to breaking the Kershaw on carpet. I have a Skyline and Salvo and use the crap out of both with only routine sharpening. I've cut everything from drywall to carpet to whittling down lumber with them. They're not the best looking knives, but they work. Unless you're carrying a knife as a fashion accessory rather than a tool, then you shouldn't worry about having someone use it. (yes, there are times a knife makes a good fashion accessory rather than a cutting tool)
...
...get the right tool for the job. In defense of this guy (who is obviously not a knife guy) he doesn't know that a knife has a limitation of not stabbing into carpet and pulling it up. From the point of view of a non-knife guy, what the heck is the point of carrying a knife if you can't use it to do the things you need it to do?
'nuff said.