rasicm is strong because people notice patterns, those patterns become stereotypes and then those stereotypes become self fufilling
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racism is strong because nobody seems to realize that loving their heritage is the other side of hating someone elses
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racism is strong because while not being an exact science, there is definite truth to it ... for instance it is by no means true that every black is a criminal or every muslim a terrorist or serial killer white, but if youre looking to make the most out of a traffic stop or rooting out terrorists in an airport or on the hunt for someone strangling ho's you all know where to look first
Actually about 15% of serial killers in the USA are black. They have 15% of the population, so it's about Even. In other continents you also have serial killers, it just seems that white serial killers have been documented better. (Or maybe they're just better at it.)
I do agree about the "loving your heritage" part. Why should somebody be proud cause of their skin colour? Be proud of what you have done, not someone 200 years ago. People that are too much inlove with their own kind tend to have no self-criticism and after a while anger/hate arise towards other groups, just because they are different.
About the athletic part: i think there is a genetic basis which makes west-africans (and people from west-african descent) better at sprinting. More fast muscle fibers, higher calf insertions.
Afro-americans are imo not better than west-africans, they just have better training, food, and drugs (there never was any selective breeding, maybe a little survival of the fittest, but that's prob neglectable). Considering the average afro-american has 20-30% white genes, you could see africans dominate the sprint one time.
Whites seem to be better at sports that require an alround performance. (Strength, endurance, speed -> swimming, triathlon, mma, decathlon, strongman comps, ...). Most olympic medals are won by caucasians.
Still, it's no basis to say any race is superior than the other. Every "race" has flaws. Whites generally have a weaker back, blacks are more prone to coronary/heart disease, etc...