Okay, but have they attacked us recently?
No, but if any of you paid real attention to the scene, you'd find out that theres been a lot of fuss over cyber-attacks/cyber-defense in the coming years.
China's been rumored to have been facilitating cyber attacks against its targets and hiding behind plausible deniability.

The real reason for the SOPA/PIPA/CISPA bills isnt copyright reasons, though thats a huge steam train pushing it, its concerns for the defense of the US Network by enabling the government to shoot down access to foreign websites in a national emergency.
All these recent efforts by Obama to get an Internet "off-switch"? Blame this tension.