Yep, just another example of societal schizophrenia/multiple personality disorder. Double standards like these are found throughout modern societies mainly due to the fact that our "rulers" are imbeciles and so drawn away from philosophical and even consistently rational thinking.
I think the main reason they were taken off Motherless is judicial. The act, recording, and distribution of bestiality is illegal in most of the Westernised world whereas the recording and distribution of animal cruelty and killing is somewhat of a grey area and the same applies to snuff films.
