My common sense tells me the reason drunk people fall overboard is because they are trying not to vomit on the deck. They have been taught to run to the bathroom to vomit. But on the ship they run outside to vomit in the ocean. They don't realize what a dangerous thing they are doing by hanging over the rail on the deck because they are top heavy.
If the ships create higher rails then it will save the drunk people's lives.
It will also save the lives of people who get sea sick all of a sudden and want to go vomit on the ocean.
I once saw a lady say she was sea sick and asked someone where the restroom was..... I don't know if she got there on time. I notice that some decks don't even have public restrooms on some ships. A lot of the restrooms are hidden too.