You have to think too, some people like to use torrents to get software.
Using torrents without an AntiVirus is just plan stupid, imo.
Also you have to realise that some people aren't exactly pros at computers. Particularity young teenagers I have noticed (13-15 year olds) download from
willy-nilly and when I open their IE half of the page is filled with toolbars.
Then I have to spend a good amount of time fixing their PC D:
Why anyone would want to install SmileyCentral Toolbar is beyond me.