I have to add that I very much agree with Roosh on this one rather strongly disagree with Atlanta man. I agree there are advantages and disadvantages either way however I do feel that the narrative is strongly biased towards mixed-breeding.
I don't agree that the expression of recessive diseases is a problem, as it rather is a mechanism to "weed out" the bad genes. Let us take an example. Below we have four individuals, two from each group, with the two from one group carrying a recessive disorder (01, 1 being the problem variant)
Inbreeding
01 01 | 00 00
00 01 10 11 | 00 00 00 00 = 2 carriers, 1 "weeded out", 5 non-carriers
Outbreeding
01 00 | 00 01
00 01 10 00 | 00 10 10 00 = 4 carriers, 0 weeded out, 4 non-carriers
It be seen that inbreeding produces a healthier subsequent population than out-breeding. 2 carriers vs 4 carriers and 5 non-carriers vs 4 non-carriers.
OUtbreeding has the effect of 'hiding' the problem variant and allowing it to spread through the population. Inbreeding however, exposes the problem variant and pushes it into lines that will not reproduce (1,1), thereby eliminating a certain amount of bad genetic material, and 'purefying' the remainder. Outbreeding simply kicks the can down the road.
Everyone is aware of the term hybrid-vigor, yet funnily enough very few people would be aware of the following.
Mixed race people (atleast in the UK) suffer greater overall health problems
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1448064/
"Objectives. This study compared the health and risk status of adolescents who identify with 1 race with those identifying with more than 1 race."
"Conclusions. Adolescents who self-identify as more than 1 race are at higher health and behavior risks. The findings are compatible with interpreting the elevated risk of mixed race as associated with stress."
The researchers attribute the poor results of the mixed-race people to "identity issues" yet this does not make a lot of sense given mixed-race children in the UK are rarely persecuted and well represented and accepted into society, for instance Craig David, Jessica Ennis, David Haye, Rio Ferdinand to name a few prominent mixed-race celebrities.
A US study with similar results
http://www.unc.edu/news/archives/oct03/u...02003.html
"A new study that involved surveying 90,000 adolescent U.S. students showed that those who considered themselves to be of mixed race were more likely than others to suffer from depression, substance abuse, sleep problems and various aches and pains."