Why do some Americans say China is going to attack US?

I haven't really heard of anyone talking about China going to war with the US.....why blow us up when they are making so much money on us. With all the national debt borrowed from China, China basically already owns the US anyways. I say that China is attacking the US financially probably....not really anything against the US, just more them wanting to be the world power. I think we're probably more concerned with middle eastern terrorists and crazy koreans right now.