I full heartedly agree, and even in the current political climate we're in now I still think an attack against the US would be a largely unifying factor. But I don't believe China is that bold (or stupid) to outright attack us, or a more likely scenario payout a third party to do their bidding.
They've been playing the "I'm not touching you" game for a long time now, I find it hard to believe they would just jump the shark. Unless we started as
@R.Caerbannog stated, actively pissing in their cornflakes. Even then, wouldn't it be difficult to hide that we're actively trying to provoke an attack in a world where almost all information is barely kept secret?