Lack of consent seems to be the main reason people are citing for why bestiality is wrong, and is also one that seems least consistent with other types of animal abuse (that they seem to care less about). Avoiding bestiality due to diseases seems like a fine reason to me.
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We don't have to eat meat anymore
We also do a lot of shit to animals that's beyond simply eating them (sterilization, separating from young, using furs, killing all the male chicks in the egg industry, etc.).