True, but some of that should be built-in to at least some degree. An 8 year-old dresses like Britney Spears, but that's because she doesn't know much about sexuality. She doesn't realize that she's degrading herself or could be turning on some old pedophile pervert.
Watching dangerous or exciting situations in movies or TV is different, because kids have at least a slightly better understanding of danger. They know that there is such a thing as death, and that the character COULD be hurt or killed (that's what makes it exciting). So, depending on the kid, I would think there would be less of an inclination to actually try what they see.
That's exactly right. And you pointed out in your other post that they emulate danger and violence. But somewhere between grade school and drivers ed, common sense kicks in? Do you mean that we all don't see idiots talking on cell phones while driving? Couple of weeks back, an idiot in a dump truck tried beating a train. He killed his passenger too. The train engineer said that you remember their faces in your dreams for the rest of your life. People DO try to beat trains. The train always wins.