Um, plenty of violence is deemed inappropriate. I doubt much of USA broadcast TV even comes close to a hard R rating. I'd also point out that Italy in particular has had little problem with making hyper-violent content like giallo movies, in addition to showing copious nudity, and Norway has quite a few violent horror films under their belt.

It's more broadcast standards originally prevented anything, nudity or extreme violence, from being shown, and mature content was exiled to cable.