The point here is that it seems extremely unlikely image search results is the actual result of a sift through the available indexed data. Meaning that some manual mechanism is responsible for the page being blank.
It must be. There is nothing in the words "tank man" that would trigger any sort of filter. My guess is that this was supposed to be limited to Chinese IP's and someone forgot to add that to the config.
I agree, and this probably isn't good; but, I want accuracy in what's being said when it comes to censorship. We shouldn't win against censorship by hyperbole but by the unfiltered reality being so horrible that people wouldn't want it, anyway.