Parvateshwar: Yeah this is pretty stupid to us, but it highlights the general distrust of older people (that is, 60+) towards video games. Most don't understand video games any more than they understand the series of tubes that carry their interwebs. In Australia they are even more paranoid towards video games, I guess we should be thankful that the US is more friendly because almost all our games come from there :)
But there is the issue of addiction when it comes to games but one can't look at video game addiction on the same level as tobacco addition or other substances. The latter is a physiological addition that, when the body is deprived, causes real and sometimes serious side effects. An addiction to WoW is a psychological one, if you take someone off it they might be depressed but that's about it. And probably because they were depressed beforehand because they spent all day getting t-bagged by Night Elves. My source is firsthand experience :)
And as for violence, that's just silly. Look at crime rates in the US pre-90s, right before the console revolution. It's easy to see on the graph just below that there is a huge drop. Was it the Super Nintendo that actually reduced crime? With no evidence I can say absolutely!
[url=http://en.wikipedia.org/wiki/File:Violent_Crime_Rates_in_the_United_States.svg]http://en.wikipedia.org/wiki/File:Violent_Crime_Rates_in_the_United_States.svg[/url]
As far as I know, psychological addictions can actually give you withdrawal symptoms quite similar to what you'd get with a physiological addiction such as drugs or alcohol, because there's still a physiological element to it (especially where endorphins are concerned. Which is why it's possible for someone to be honestly addicted to sex. More than would be normal for a healthy human being, I mean :P)
But that's neither here nor there, because it's possible to get psychologically addicted to just about anything, and thus it's nearly impossible to have warning labels for all possible "threats." This does bring up an interesting question about how Blizzard's games should be treated, however. Because they use very calculated psychological manipulation to keep players "addicted" to their games. Facebook games do the same thing, if much less subtly. It's not like this should be illegal, or even that it's a bad thing (that's half of what makes things like Diablo so much fun). But then again, it's something that people really should be aware of (perhaps not through ham-handed warning labels, though). It's been proven that just as there are some people who can't use alcohol responsibly, there are some people that don't play WoW responsibly--sometimes to a very severe extent.