Look at this site, http://news.bbc.co.uk/2/hi/uk_news/7777635.stm
There are more than a dozen with cause of death listed as "beaten" as well as some that say "other" and a description involving physical assault.
I'm not dismissing the idea that you should have more tools in your arsenal. However the idea that a punch is not sufficient to kill is very wrong.
The man in the story could have avoided the bar scene and not had the issue. True that it isn't his fault but drunks looking to fight are most often found around bars, so to avoid the drunks you steer clear of the bars. Just like it's not the rape victim's fault that she was raped at a party but not drinking half a fifth of whiskey and hanging out with random strangers would definitely go a long way to prevent the rape.