Reddit mentions of When Victims Become Killers: Colonialism, Nativism, and the Genocide in Rwanda

That ELI5 is, of course by nature, too simplistic. The Germans didn't "install the Tutsi into power". Instead, Rwanda as it exists today is one of the few countries where the current borders pretty closely approximate with the borders of a complex hierarchical kingdom that existed before the country became a colony.

Colonial powers prefer using existing governing structures as it saves them the time and effort to set up an entire administrative system of their own, and in the case of Rwanda, this was easier than usual. They simply solidified the existing system, so in their eyes, at this point they weren't inducing volatility at all, but strengthening a stable system.

After WWI, the Belgians took over the administrative functions and they not only continued to rely on these governing structures, but, guided by the racist and eugenics movements of the time, came up with a racial explanation for the Tutsi rule: their superiority was demonstrated by their lighter skin, aquiline nose, tall stature, etc. as opposed to the broad-nosed, darker and shorter Hutus. According to this new racial mythology, Hutu were Bantus while the Tutsi were part-Caucasian.

So they didn't intend to induce volatility, but they certainly weren't well-intentioned when they decided how to rule. As to direct economic gain, Rwanda has few resources and covers a small and landlocked territory, but it was well-suited for cash crop production of mainly coffee and some tea.

This is another important cause of the volatility of the country in itself. The post-colonial one-party dictatorship under Hutu rule relied almost entirely on a mix of foreign aid and profits from the coffee trade, and purposely kept the country rural and the population uneducated in order to maximize the exploitability of its only profitable natural resource.

When coffee prices plummeted in the late 1980ies, this caused serious problems for the regime as both the international and domestic communities as well as the exiled Tutsi community in Uganda mounted a serious opposition to the dictatorship. They were eventually forced to agree to political reforms, but hard-liners who were unwilling to relinquish their power seized control after the assassination (probably by the RPF - Tutsi rebels from Uganda) of the President, were able to use the years of anti-Tutsi propaganda, trained submission through dictatorship, and fears about the rebels from Uganda to organize the genocide.


There still is a lot more to it, and it is also interesting, but worrying to see many parallels between the current post-genocide Tutsi government and the pre-genocide Hutu government. I mostly based the above on academic sources, but more accessible reading I could recommend about the country and the region would include Dancing in the Glory of Monsters and anything by Prunier and Mamdani. Jared Diamond's Collapse has a chapter on Rwanda which focuses on the economic dimension; it's a bit controversial, but based on some very interesting research.

I'd recommend these ones:

http://www.amazon.com/When-Victims-Become-Killers-Colonialism/dp/0691102805

http://www.amazon.com/The-Rwanda-Crisis-History-Genocide/dp/023110409X

Bit more academic, but still accessible and more reliable than Gourevitch, who doesn't have nearly the same knowledge of the country.