Many TV shows are violent, some are suggestive to sexual thingies.. As kids are innocent, they would do what they see on their environment. And one of the biggest influence is what they see on TV. Even cartoons/anime are showing violence.. See how Tom/Jerry beats each other in "Tom and Jerry" Show. Even TV drama series are suggestive to "sexual thingies" (dunno how to call it). I think this is something that should get our attention, since it can effect on the kids as they grow.
Do you monitor what your kids watch? If it's violent or maybe suggestive to sexual acts?