Different (knife) strokes for different folks. Danes, in particular, are a strange lot. My brother is married to a Danish woman and lived there for many years. They look to the common good much differently than americans.
As for the knife confiscation--when I was much younger and lived in Virginia, a state well known for broad weapon rights protection, I had numerous knives "confiscated." I suspect that the officers kept them. Who knows. During the years after the rise of TSA, I probably lost a half-dozen knives.
As for the doorman's story--I recall that within the last few years there was a story about OHO in NYC or NYS somewhere. A knife owner was prosecuted under the gravity knife exclusion. As it turned out, the knife was modified or so loose from use and/or poor construction, that it was a gravity knife. In another case that received much "knife rights" attention, where a man reported that he was searched because officers saw his pocket clip, it turned out that there was a lot more going on. My point is that the doorman's perception and story to the forum about the "altercation" may not fit other people's reality about the situation,... He didn't end up in the hands of the police because he was opening a package. I suspect that in almost all cases, people (including mine) who have their knives confiscated (by anyone but TSA) were likely not conducting themselves as gentlemen.