Would certainly tend to agree with you Rev. There are some intangibles, such as the distance between the lamp posts, tension between the lamp posts of the rope holding the knitwear in question, and historic wind speeds in that region which would create force on the items in both a wet and a dry state.
But of course, it's all nonsense - if it's enough to bring down a lamp post, then they were under specified to start with.
It's all about allowing precedents to be set if they didn't do something.
About 15 years ago, I was doing some temping after being made redundant, and got posted to a company designing and installing mobile phone masts. "Do you have any experience using CAD?", they asked. "Yes", I lied profusely to keep a roof over my head. For the next six months, I modelled and designed mobile phone masts, including the positions of the aerials, the bearings in degrees, and put them through computer simulations with the highest ice and wind loadings ever recorded in the areas where they were being installed, all without the slightest bit of training. I only left when they were so impressed with my "work" that they offered me a full-time position, because I knew they'd figure out I was useless. But there's probably about 500 mobile phone masts out there that will either stand forever or are doomed when the next ice storm occurs.