But have you ever considered that the difference between your arguments (i) to (v) (with exception of (iii) maybe) is the intention of the humans involved not the suffering or the dead of the respective animals? This kind of moral reasoning is human and can be seen in other areas as well. For example, we care a lot more about the comparably "few" deaths caused by terrorism vs. the many caused by traffic, because presumably in the former there is intention of bad guys involved whereas in the latter its merely bad circumstances and chance. The result is the same: an animal or a human is killed. However, the moral reasoning is different. Just saying ...