> So why are they extinct?
Compare a "diverse" group of street thugs against a non-diverse group of, say, all-white Navy SEALs or all-black Army Rangers or all-Innuit Delta Force.
Or a truckload of chihuahuas, pomeranians and other fishbait dogs against a pack of wolves.
Diversity does not necessarily mean strength. Nor does it mean weakness.
Yeah, but that's giving our ancestors more credit than may be due. My personal guess is that disease wiped out the Neandertals when we arrived in their homelands, much like the arrival of Europeans -- and the diseases to which they had developed immunity -- nearly wiped out the native populations in the Western Hemisphere.
Im imagining a punk chewing gum while punching his fists together, a shifty fellow in a raincoat probably with a shotgun under there, and a skinhead with a baseball bat leaning against a wall.
Three less diverse clonetroopers have just landed nearby and engaged them..and...oh they lasered them all. Your analogy turns out correct in my imagination.