Pretty sure the only thing it depends on is if the country has oil and which side of their civil war is going to sell it to us. As well as how 'brown' the people are. Probably some equation like Y= 'Propensity to sell us oil divided by melanin squared."
Also, reducing nation-wide (even world-wide) protests down to "because one cop kills a guy" is a bit naive, don't you think? Same shit was happening with Rodney King in the early 90s, and every few years since. Are you aware of how many videos of dirty cops are on youtube? Shooting people in the back, shooting people who are handcuffed, planting drugs and guns on people, making up phony charges, etc etc.
As for the cop who was murdered, yes it's a tragedy. All violence appalls me. If you think this meme was my way of insinuating that the protesters should have guns, it's quite the opposite.