- he was bored and had to something/anything
- his mouse happned to be near the link and he just cliked
- out of sheer curiosity
And, if 100 people visit a site, at least one of them will fall prey to it at least once in 100 years
Now, if you send 100M mails, the final number may be more than 1!
Bottomline: we need strict rules and better teck to handle spammers.