I have two kids. I don't actually mind when they see advertising because it has given me a great opportunity to explain the tricks being used to sell product. I think they are generally wary of advertising now because of this.

Right, and it's not the tobacco industry's fault that people die of lung cancer, people should just know better than to smoke in the first place.

And if you didn't know, children will eventually start using computers by themselves, probably before they are 12 (probably in first grade or kindergarten, I wouldn't be surprised). A huge portion of internet users are children. That's a fact. The reality is that a huge portion of children are online, and advertisers are specifically targeting children on youtube.