Just out of curiosity, do you have children? After the birth of my daughter, inserting those plastic inserts into every unoccupied receptacle that was plausibly within reach of a child was one of the first things we did. The first thing she did after learning to walk was figure out how to take them back out. Kids play with anything and everything while they grow up, mine used to even pull all the little rubber plugs off the ends of the doorstops. I don't care how caring and careful you are - you cannot watch them every second, and that's all it takes for them to poke an object into a live receptacle. I am not at all in favor of many of the recent "improvements" to the NEC, but I have no problem at all with this one. If I could have installed them 20 years ago when my daughter was a toddler, I would have. That would have been caring and careful.