And this is why...
...I always use ad blocking extensions etc. on all my browsers. It's not that I don't understand the need for advertising to help pay for the sites, it's just that one click on one bad ad can lead to an absolute world of hurt that I'm not willing to expose myself, or my PC's to.
The advertising industry needs to come together and decide just how they're going to keep this clean and free of malware etc - and if that means coming up with a whole new controlled system working with sites and browser authors then so be it.
They created this problem, now they need to fix it. Until then, AdBlock stays firmly installed on my Chrome's.