You’re point about timing brings a thought to mind. If this was a planned operation, by some entity, to cause maximum damage/terror...why wasn’t it done at 8am? Similar to 9/11?
That’s exactly what I said to someone right after I heard about it and the rumors started flying that it was Islamists.
However, China/Russia aren’t really in the terrorism business as much as the economy destroying business when it comes to the U.S., and shutting down a busy port has ripple effects.
I still think this was pilot error or careless maintenance or both.