What I said was accurate on both counts.
WW2 was not the highest body count of the 'modern' world, you having that tunnel vision and your strange premise of comparison creates your flawed reasoning as to why we've changed. But let's look at that 'kill rate' reasoning and some thing you left out. Somehow you forget WW1? The slaughters in so many areas of the world that have taken place over the bulk of the 20th century? How about the Taiping Rebellion? Did you even know about it? WW2 did not kill as many people. The reign of Stalin? The Russian revolution? The Khmer Rouge in Cambodia? The Chinese revolution? Millions and millions dead in the virtually constant wars in Africa during the 20th century? The reign of Mao? Millions killed in Vietnam? Etc. Etc. Etc. You're fooling yourself.
The war to come will be unlike anything seen in the history of the planet.
Incest avoidance is only a small part of human sexuality, and that mostly revolves around smell. The ocular is the more dominant sense in what humans consider attractive, and genetic symmetry is the key, as well as other traits that the subconscious mind studies. If you wanted the single most important aspect, a face that is not altered by genetic defect or infection/sickness in the womb is what the human eye sees as 'attractive'. This is the most dominant trait of beauty, immune system and genetic traits revealed in the symmetry of the face and body.