Yeah, China's a really sad state of affairs still. The market (probably?) wins in the end, but they're doing a damn good job suppressing the Internet from the majority, still.
I have a Chinese friend here, moved here two years ago, I ask him about public perception in China of things all the time, and one of the things that came up with Tiananmen Square.
He says to me, "I know the story now... but I didn't when I was in China. I don't think many there knows about it. The government is very protective of their wrongdoings in China."
Anyway, back on topic, there's a ton of natural oil seeps (in the Gulf of Mexico too) every year that are much larger than most people realize. The ecosystem deals with oil fairly elegantly (spreads light crude thin, which you can see on satellites, then hurricanes/organisms eliminate it safely, dark stuff falls to the bottom and does the same sort of system).
While its clear these spills are terrible, its not clear (to me, at least) what kind of unnatural effect they really have.