They don't know what the motive was but they know what it wasn't? Somehow that doesn't compute.
I don't think terrorism was behind it, since his name was Chinese, not Muslim. But I don't KNOW it, and I don't see how the police or the reporter can be so absolutely sure of it.
No doubt many people would be stupified by a sudden attack like this, and would panic just as the passengers of the bus did. But is it totally out of the question to wonder why nobody did anything to at least slow the murderer down or inconvenience him a little?
There are PLENTY of Chinese named Muslims, in and out of China. Millions of them.