An interesting discussion going on over at PC Pro who reports the BBC spending money to expose cyber crime committed through "botnets"- A network of compromised computers which can be used by a hacker for cyber crime at any time. So, why don't the government broadcast short little messages on TV to warn people about the risks of not having security software installed? They do it with health risks and in Hong Kong, they even have ones about dropping litter or making too much noise at night.
There's pretty much no excuse not to have any security software installed with all the free solutions out there just now. If people were more aware, botnets may decrease in number and lower the damage being caused but, I guess the risks aren't high enough to justify money being spent on such a campaign.