For at least an entire year, "French military victories" top result was "did you mean French military defeats"
For several weeks, Google reported the "political philosophy" of the California Republican Party to be "Nazism".
And of course there was what happened to Rick Santorum (which remained in place for at least an entire election cycle despite gaining fairly widespread attention at the time)
This sort of thing happens from time to time. The most common cause is wikipedia vandalism that gets indexed, though in this case it seems to be a very highly-ranked image search result for the image on reason.com.
It's fairly common for these things to appear, and also surprisingly common for them to last a long time after they come to light, unless a Grade AA stink is made about it. As a general rule, Google won't remove something like this directly from their index unless they "have to", and will instead add it to the training/test set for their "bad result" model and will then wait until the models take it down themselves (if they ever do).
Though if this post gets enough attention, it'll probably get fixed in a few days.