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You say "Nature discourages this behavior by making a small percentage of the offspring of these matings effectively sterile, i.e. homosexual."Any evidence that inbreeding is correlated with (never mind causes) homosexuality, or is it just blind prejudice on your part?
Of course modern medicine is working with evolution. Bacteria that are resistant to antibiotics are selected for in people who do not complete courses of antibiotics, leading to resistant strains. TB is one of those being actively selected for, as there are now variants that are drug resistant ( as most patients stop taking the drugs when the initial effects clear because the drugs cause nausea and general malaise) and a developing strain that is MDR - multi drug resistant, and which is almost totally unaffected by the most common TB drugs, only showing a poor response to a cocktail of drugs given at high dose. TB is thus being evolved into a killer, instead of being just a parasite that slowly kills the host, allowing the disease to spread, it now kills the host very fast.There is not much TB drug development, the payback to develop is poor, and there would be little profit in drugs where humanatarian concerns would drive the quick development of low cost supplies.