I would have to say that I agree and disagree with both arguments ( which is different for me as I can get very opinionated about certain subjects ).
I think that the first consideration should be for the animals, I mean, some animals can be inter-bred quite successfuly, for example the Bengal Cat or the mule which is a cross between a horse and a donky, but others just don't mix well at all producing an animal that just wasn't meant to be ( I can't think of any at the moment ).
I personally don't really believe in cross breeding myself, but as long as the animal produced is 100% a healthy animal then so be it. I might even find one that I like.
Thanks for reading my rather long winded reply, I'll try to keep it shorter next time
Growing old is manditory
Growing up is optional