This is certainly the most impressive waterfall that I have ever seen. The nice thing about Iceland is that they seem to expect intelligence from the people. That means that everything is not safety guarded to the point that the view is cluttered. The only crowd control were some very low stakes with rope tied between. Easy to step over if you are so inclined, but they do get the message across.
Personal responsibility is probably the key around here.
In the grocery store, customers are expected to weigh and mark their own produce and bag their own groceries. In general, Icelandic stores seem to require a bit more effort on the part of the customers than do US stores. The Icelanders do use the same marketing techniques. There are many bookstores here. The Icelanders are a very well educated group.