>>32454884thing is though in communal animals, homosexuality provides orphaned animals with surrogate parents,as seen with penguins, thus allowing the offspring to survive and produce babies of their own. therefore its more of a benefit than a hindrance to the species survival.
necrophagia is important in the ecosystem as well, giving plants and animals nutrition to survive by recycling nitrogen and carbon back into the soil.
I'm not going to defend cannibalism since it is a sick thing to do, but its only usually done during extreme circumstances when food is extremely scarce or absent altogether. those people who kill and eat human flesh for pleasure are usually suffering from extreme cases of schizophrenia, and as for native tribes who used to practice it, the tradition has been discontinued for well over 2 centuries.