I start with Bio-Evo (~580 words) although the Phil/Evo aspects (~890 words) are more fundamental. The latter are likely too difficult for most – but I encourage you to try - the issue of “holocaust denial” makes it at least entertaining.
Among the great apes, slavery is natural in all the races of the human (H). We should not be surprised about our personal slave behavior, as it comes natural. This co-evolution, or denied “back-reaction” of environment on the sub-systems is a general mechanism, consistently producing the denial of it, for example similar with rape: