You watch some evening "kids oriented" cartoons on Nick and Cartoon Network and the amount of innuendos make the overtly violent yet slapstick jokes of Loony Tunes and Tom & Jerry seem like Nosferatu to today's gore horror flicks. There may not be any depiction of violence, yet the implied consequences are far from kid friendly. If anything, cartoons today may be creating a generation of kids with far deeper sociopath like morals than Loony Tunes or Tom and Jerry ever did.
To Mark's point, failures in parenting get attributed to a multitude of external influences. TV, Friends, Cell Phones, Teachers, Video Games, Internet, Movies, you name it, but, never the Parent. My ex's 8 year old niece has been allowed to watch 'Adventure Time with Finn and Jake' and 'Regular Show' since she was 4 and are her favorite. Her parents watch them too, yet seem blissfully unaware of the content. They are cartoons right, what harm can it do? Adventure Time is one of the most bizarre "kid show" I have ever sat through and in my book Regular Show is probably okay for 10+ year olds, yet rated as 'E', for Everyone.