You can just see where this is going,
Crew refusing to carry race horses because they think its cruel to race them and keep them in boxes, crew refusing to carry wild animals because the do not agree with animals being kept in cages in zoos, refusing to carry hatching eggs because the chicks might be kept in confined spaces, then there will be the ones that wont carry live fish because the dont agree with keeping fish in tanks or ponds, etc etc, Its part of the job, accept it or go fly SLF!