And they’re almost all Windows users too:
Fortunately the vast majority of the people who saw the ad ignored it, but still, 409?
The only defense I can think of is at least some of them maybe interpreted it as “pc infected? get it cleaned here” Now if the ad had stated “Do you want you computer to get a virus? Click here to ruin your computer” that’s a wee bit different.
While one should never underestimate the stupidity of your average person, I suspect that a significant proportion of these were accidental clicks.
409 hits isn’t very many at all - and I would hazard a guess that even more than “accidental” clicks, many people who clicked on it did so to see if it was a joke or something that ought to be reported to Google.
I have a “canary” PII PC on my network that is only fired up for checking out whiffy-looking downloads without sticking my neck out. If I saw something that might be illegal and destructive at the bottom of this page, my first reaction would probably be to VNC into that box (no monitor on it) and investigate it. If it did try to install malware I’d report it and restore my canary to it’s uninfected state. If it turned out to be a harmless security geek, I’d shrug it off.
…or smug Mac users.
Like me. 
I just came over here to post the same thing, but found this thread before I started one.
Yes, some people are idiots.
Of course, 24 of those people aren’t even people, unless there’s a new browser called “AdsBot-Google” that I don’t know about.
Kinda like those people who paid hundreds of dollars on Ebay for an empty X-Box 360 box when it came out last year…
My one time roommate had a “sacrificial virgin” computer. He used it to “try out” reported dangerous sites, or software. He could wipe it and reload it in fifteen minutes, or so, and the entire process was basically unattended after a few keystrokes. He deliberately got himself “da Vinci” when he found out about it. (Which was when I knew him.)
He was some sort of ubergeek, working for a computer security company, last I heard from him. Lived in the basement, no kidding, and had every computer game in the world, and five computers running most of the time. (not including the Sacrificial Virgin, which was booted up only for its intended purpose.)
Strange, strange world we live in, Master Jack.
Tris