I checked, and they are still selling knives. Sure, you can use a knife to cut food or walk through the woods pretending to be a "survivalist" (judging from my search for "knives"), but it can also be used to murder people.
But also checked "TVs", and they are absolutely still selling those. TVs are like the number one item used for infringement. I am VERY confused.
And don't get me started about food. Without food, it's basically impossible to infringe, yet ebay allows all sorts of food listings.