.....how the hell did anyone in that country even managed to survive long enough to make a country? Trapping is literally the second thing humanity came up with in hunting. Not knowing about traps let alone how to make it when you're an experience hunter is like not knowing how to light up a stove when you're a chef.
Then again... there are actual doctors and nurses that don't know how to perform CPR, so there's that. But in their case, it's more that they never had enough time to get a refresher course to remember how to perform it than not knowing about it.